My favorite Steam comment on topic is this one:
On the contrary, the problem is the developers are good at math, unlike PF adventure path writers.The developers aren't very good at math is the answer.
Basically the typical PF adventure is filled with horribly underpowered NPCs, like fighters who take Skill Focus (basketweaving) instead of Weapon Focus.
And then Owlcat releases a game where NPCs actually pick feats that are good for them, and everybody cries.