considering the current "endgame" bosses we have, let's see:
Savage: out of all 5 fights, only P2S has no positionals
EX Trials: only Hydaelyn has positionals, so okay, fair
Ultimate: DSR has two phases with no positionals (eyes, a very short phase that really doesn't need them, and double dragons). UCoB, UWU and TEA all have positionals in every phase, and they should obviously be still considered high end content
so, out of every single piece of high end content out right now, three fights have no positionals, i'll give you three and a half if you want to count the DSR phases. what do you make of this? are you sure "many bosses already have none"?
I'll agree with you that positionals have little impact and that they will hardly make a difference on whether someone clears a fight or not, I don't think the dps loss is as small as you make it out to be but it's not huge either, but still. IMO positionals should indeed have more impact so that one could show that they can play their job and have spent the time mastering over someone who doesn't. I don't think someone who just picked up Monk should be able to be pretty much on par with someone who put in the work to play it properly and learn how to work around the job's quirks (which, until Shadowbringers, was the fact that it had a positional on every single one of its GCD combos). sadly, it seems like square doesn't agree with this vision