Based on what Ive read on the interwebs it seems most never crimp for the semi-autos but a few do and swear by it. Crimping for a bolt apparently is never done except for the occasional hunting load.
The internut is full of dogma echo chamber crap. I LEE FCD every 223 round I make for AR and Bolt gun.
My approach is that since I load too much 223 to anneal without a hefty investment, the FCD improves neck tension consistency.