Not sure why I should really even bother posting anymore. Jester David has done a fine job of articulating my viewpoints far more effectively than I ever could.
I do think, however, that a lot of people are assuming far too much about what Bounded Accuracy is and isn't and what it could or couldn't be in Pathfinder.
As Jester David pointed out in a very early post in this thread, the number progression of BAB/AC/To Hit numbers is not much more than number porn. The ONLY thing it accomplishes is locking you in with a limited number of monsters you can fight because their numbers are close enough to yours.
With bounded accuracy, a +1 to hit actually means a 5% better chance to hit.
That's not even really the purpose of my posting though... love or hate bounded accuracy, at least understand what it represents.
All it means is that certain numerical parameters are set and the game is kept within them.
**** It doesn't mean PF2E has to copy 5Es BAB progressions.****
It means PF comes up with a range that works in PF, and adjusts around that. Fighters might still end up with faster BAB progression than other classes, unlike 5e. But when BAB and AC just keep going up-up-up, it becomes diluted to the point that the die roll is borderline meaningless at some point.
As for the argument I keep seeing, "Well, if you want to play 5E, play 5E," clearly I want to play PF, but I found a mechanic in 5E I believe would benefit PF. I believe that Wizards found an elegant solution to a problem that has plagued D&D since OD&D, and that solution would be just as elegant in PF without sacrificing PFs depth and customization.
Yes, I'm going to admit it... I'm a Role Playing over Roll Playing purist, but I prefer PFs crunchiness. There, I said it, sue me.
But that doesn't mean 5E didn't come up with some good ideas, and one of them in particular is something they should have done in 3.0, instead of slavishly sticking to the number porn.
One more quick thing of note... I've noticed quite a few people in this thread say they (as one poster put it) "ran screaming from the playtest when I saw Bounded Accuracy."
So did I. I hated the playtest. I ran a campaign, adjusting to the playtest as it went, and I couldn't stand it. The game they tested and the game they released are not the same. I highly recommend you give it another shot.