I mean, as i stated, i can’t really vouch or argue against pf2e, since i dont play it and haven’t really read the rules of it since it was in playtest. That said, just googling, i see some things that could be considered exploits like a reddit thread talking about being able to do 520 damage in one attack, some chatter about a “resentment witch” being able to make power word stun or color spray effectively permanent, and a youtube video by the rules lawyer about “OP builds”, so it seems like there’s at least some system exploitation going on.
Obviously a tighter controlled system is less vulnerable to exploitation (see D&D 4e), but that also doesn’t mean that is necessarily doesn’t exist. Another counter example system with lots of rules and lots of exploitation of them would be shadowrun, especially older versions, which were even worse than D&D in some respects.
for what its worth, the new (2024/2025) monster manual supposedly has spellcasting monsters with more “magical” actions built in. While they do still have a list of spells, they have more built in tailored “magic action” type things they would be using instead of spell casting in most scenarios, like having a “magic bolt” type attack for a mage or something. We don’t exactly know how extensive this is yet, since we’ve only seen previews so far, but it could make running spellcasting creatures a bit easier.