I don't treat handgun ammo, especially target stuff, like precision rifle. I don't shoot in high class target matches. I get range pickups all the time, so I deal with at least a half dozen or more head stamps. I have seen and culled a few split case mouths, but would not entertain the notion of exact tracking of times loaded, how it was loaded, what it was fired in, what batch, etc. All I know is that the R.P stuff felt different to reload, and placing a bullet to be seated caused concern when quite loose in those R.P cases.
You don't have to shoot "high class matches" to see the advantages of matching brass for consistant results in bullet seating, crimping without constantly readjusting dies. Your OP was, after all, about separating out RP brass, but then you take the position that separating brass is not necessary. I would suggest that there are differences in feel and dimesnions with a lot of different brasses out there.
I guess haven't picked up much mixed revolver brass on the range floor. but I have handed factory ammo boxes of empty brass. I use the loosies to replace split or damaged ones.