Don't forget Righteus might. I loved that spell. It was downright nasty when paired with monkey grip and huge keen scythe.
3.x/PF1 loved those bonus hoarding and buff stacking (so long as it granted different type of bonus, but there were quite a few of those). Pre fight buffing was practically standard. Or first round or two buffing while meat shield holds the line and soaks the damage.
Played and ran fair bit of high level 3.x/PF1/5e with people who had great deal of system mastery. Game just falls apart. There is a reason why levels 3-8 (streching to maybe lv 10-12). After that, it starts to crack. 15+ and PCs can do some nasty nasty stuff.