I shoot a 5d3, and always shoot mRAW during getting ready photos and receptions at weddings - the only times that couples are really going to blow their pics up is during the portraits, so that's when I shoot full RAW. While many gripe about the 5d3 being "only" 22 mp, that is still far too big for me to want to deal with for an entire wedding. Managing that much data for 30+ weddings throughout the season is especially difficult when you factor in backups and archives, so, imho, that is precisely what the smaller raw files are for - people who shoot massive amounts of pics but still need/want the extra flexibility of raw.
My primary body is 1DX and I have mostly stuck to RAW or jpeg L on rare occasions. And good many times I shoot in bursts and the workflow and logistics involved have slowly moved me to reconsider. But on a more pedantic level, this got me looking into how much we actually know or don't know about the algorithms, likely varied among the different bodies, and the effect on IQ.