I have been using a combined RAW and JPG workflow for years. Using my D800 and D810, I have been using two cards (RAW on CF and JPG on SD), all maxed out, 14-bit, lossless compression. Moving the files onto my NAS, I have imported (with reference) files into LR, into two separate catalogs (one for RAW and one for JPG).
Drawbacks are of course that this uses lots of storage space on my NAS, and I have two catalogs in my MR to maintain...
I just got my D850, and I am thinking of moving to a RAW only workflow, shooting RAW on the primary card, and using the secondary for backup or overflow. I guess I would move files to my NAS still, importing (with reference) files into LR.
I like having the JPGs around, they were a both easier to work with, and I can export them easily to SmugMug, FaceBook, etc. But, I guess I can do that with export in LR also.
What do the rest of you do? And to the RAW only folks, are you missing the JPGs at all?