If correction was in LR, then a lot of people would do it. An oft requested feature.
Being able to correct lens distortion at the RAW stage is fantastic, you can do it in Phocus [though part of it is that some Hasselblad lens are designed with correction being done in software]. An image that looked fine, suddenly looks much better when corrected, though unless you are shooting things with straight lines like buildings, then it tends to be disguised - it's still there though.