IMO a combat round should generally take 2 minutes per person including the off-topic discussions and the dice rolls. I also don't think D&D or PF is very good at that, as a game system (too much math, even in 5e), but D&D players actually can learn the rules. It's a pretty big lift to actually learn the core rules of 3.5 or PF1, but you can do it.
I really think a big part of this is that you (the player) should not be out-thinking your PC. The idea of roleplaying falls out the window with players tryharding in every combat. If your PC has 8 int, just walk up and hit them like the dumb box of rocks you are. If your PC has 20 int, you've earned a bit of a think. Cutting off the strategy discussion, IMO, is actually part of this - a round is 6 seconds of real time, and a lot of players want to spend the first 15 minutes of that 6 seconds making a game plan.
I believe the 5e monster manual (and to some degree the 3.5 and PF MMs) was actually balanced around people tryharding, which doesn't help.
In my experience, 3.5/PF1 generally has more things to add or subtract, but 5e has a shit load of temporary modifiers to track - including counting your "advantages" and "disadvantages." PF2 does a better job (except for the part where it was written by woke trannies).