Hi Kagio, welcome to the forum....and thank you for your kind words (though there are many users here who know as much as I do about the cloud ecosystem).
Answering your questions:
1. Not at this time, though you may occasionally see special offers which might bring the Classic with 1TB plan down from $19.99.
2. It's probably a little more complicated than that. Yes, Classic only deals with locally held full-res files, though it can generate and use smart previews of those files, but of course the full-res file has to be initially available in order to generate those smart previews. But that's unrelated to cloud syncing, from a syncing perspective there is no option to only download a smart preview of a full-res original from the cloud, it will always receive a copy of the original. Lightroom Desktop and Lightroom mobile can be setup to work in different ways.....on mobile you can use the option to "Only Download Smart Previews" and the app will then happily edit using only the smart preview, but it will still download the full-res original (assuming it exists in the cloud) if you try to export with a requested file size larger than the size of the smart preview. The SP is always 2560px on the long edge, so if you specify any value greater than 2560 then the app will automatically download the full-res original.
Lightroom Desktop has similar download options for smart previews, and will happily use those smart previews for editing when the desktop device is offline, but when it's online the original will be automatically downloaded when you attempt to zoom to 1:1, OR you start to edit the image.
3. I'm not 100% certain about this, as I specifically disable iCloud syncing for Photos on all my iDevices, because it can lead to duplicate images appearing the Adobe Cloud if "Auto-add" is enabled on those iDevices....i.e. take a picture on my iPhone, it's auto-added to Lr Mobile but with iCloud enabled that image would also upload to the iCloud and from there down to my iPads....and it typically has the file-name mangled by iCloud so gets treated as a new file on the iPads and so gets auto-added back into Lr Mobile and thus synced back up to the Adobe Cloud as a duplicate. I don't know how "Optimize Storage" plays into this scenario, but assuming that the original is added into Lr Mobile before it's replaced by iCloud, and thus synced to the Adobe Cloud, then that original will still remain inside the Lr Mobile app space until it is automatically removed and replaced by a smart preview....that removal will happen in accordance with various criteria (amount of available space on the device, frequency of updates, etc.) but you can manually force their removal (after ensuring that they have synced to the Adobe Cloud) by using the Clear Cache option, either on a per album basis or a complete app-wide basis.
Hope that helps....ask away if you have more question.
Hey Jim! thank you very much, your responses are even quick; another plus. Really awesome guy you are, congratulations again I cant stress that enough (no matter if there's more like you
, I "somehow" stumbled upon exactly you, always, so, that's gotta mean something).
About 3, yeah, saw that in another post of yours; I set the iCloud Photo Library every of my client's iDevices normally, but ONLY ONE of the iDevices will have the "auto-add" LR app setting ON (the iPhone); I expect this to cover up for possible duplicates. She doesn't mind this approach given the workflow she has (she'll consider a full migration i.e kill iCloud Subscription later in the game).
Now thanks, we are clear con #1, I actually got her the Photography Plan (Lightroom + Classic + Photoshop [she dont needs] +
1Tb)
for 14.99usd; which was offered automatically when we clicked "upgrade" from inside the Lightroom Desktop next to a message about our 20Gb being almost full.
Now, regarding #2, on our session yesterday we couldn't figure out the following:
When we're on LR mobile (being this the iPhone app), we can of course see a combination of original files and/or smart previews depending on LR internal algorithm decision (Only Download Smart Previews is ON) <- but it's actually this setting that gave us doubts on the following scenarious, let me explain:
When my client finishes editing in LR mobile, she then likes having that final photo back on her iPhone Camera Roll again (iCloud Photo Library) with the highest possible quality. Or she simply wants to share the photo to an external place with the best possible quality; in both cases, she feels unsure about the exported quality (don't worry explaining how most third party apps will have their own unavoidable compressions, I'll see that part) but you see, there are
2 ways of getting the image back to (for example) the iPhone's Camera Roll:
1. Click Box-Arrow icon (share) at the top > Click Export to Camera Roll (formerly "save" to camera roll as I still see on some official Adobe guides) > and that's it!, it automatically says "exported to camera roll" with no other quality picking prompts, the image is already in the camera roll <- it has the edits, but
what's the image quality for that one?
Or
2. Click Box-Arrow icon (share) at the top > Click Export "As" > now we DO get a prompt for quality picking here <- but when we chose the file type "original" it removed any other options, and
exported the file with NO edits to the camera roll. So I'm guessing "Original" is not only referencing the "quality" part haha. Remaining options are
JPG (which let's us pick dimensions and image quality)
TIF (with dimensions, bit depth, transparency and compression options), and
DNG (Adobe's RAW format, with no additional options).
Which (including specific settings) is the best way to export the absolute top image quality to the Camera Roll then?
TLDR my questions are:
1. What's the image quality when we simply click those 1# export steps?
2. How to we export to camera roll in the best quality (including edits)
And since you said "ask-away" (and adobe really has to work on official-updated manuals) :
3. Is there a way to see the file size for any image in LR mobile? (only "trick" I noticed is when you tap "Share > Open In" it shows the size (though what if that's the smart preview size? depending on personal settings)
4. Does turning off "only download smart previews" on LR mobile mean everything in the Adobe Cloud will be locally downloaded in full quality to the iPhone?
5. Is there a way to UNDO every edit to a photo on LR mobile, sort of a reset (?) (though if you actually loss the original picture, you can always "export as original" and import back to LR mobile I guess?
Stop struggling with Lightroom! There's no need to spend hours hunting for the answers to your Lightroom Classic questions. All the information you need is in 
