I'm in the "trim revolver brass for more consistent crimps" camp myself. I've seen 357 and 44 Mag brass grow in length over the course of several reloadings and the growth isn't consistent between all cases in a certain lot of brass. So after every 5-10 loadings I will run them through my dial caliper after cleaning and resizing to see what variation I have in OAL, as well as checking the brass thoroughly for any damage. If it varies more than 5-10 thousandths I will trim the whole lot back to the trim to length.

For autoloader cases, I've never seen that brass grow or shrink significantly and never even check it except for looking for damaged brass.