Cryomancer
Arcane
You can do good storytelling and tactical combat with any of those rulesets , or any popular one ,any less known OSR , even 4E . Pathfinder kingmaker success is on its story telling and powertrip not at all related to the ruleset, this rtwp game stray far way from the original ruleset and has hardly anything in common with pathfinder.
This I strongly disagree.
Pick one of my favorite spells like Finger of Death. CR 10 creatures like a Giant flytrap can soak 3 finger of death spell, failing the save 3 times in PF2E. While in 1E, Finger of Death casted at lv 15 can OHK a Giant flytrap. Being a necromancer in this two editions is a completely different experience. Even Gothic 3, when they changed from rune magic to ancient magic, the experience of being a caster changed a lot. Changing the game mechanically have a lot of impact in the gameplay. Tomb of Horrors played in 5E is vastly different than Tomb of Horrors played in 4E which is vastly different than the original Tomb of Horrors. Which is insanely brutal.
Making an analogy with FPS games, GM6 Lynx in Arma 3 can OHK a soldier with the best body armor inside an armored vehicle at 1000m with no problem. In Dirty Bomb(Fel-ix), it can't pierce anything and you need multiple shots to kill someone. You can't say that the sniping experience is the same in both games despite both being using the same weapon in a shooter. Or with cars in a racing game. Driving the same car in NFS and in GT can be completely different experiences.
In this particular game, once they changed the spells to scale with your level, casting stooped being worthless except for summons and become way better. A single variable alteration changed the game experience. I know cuz I played when snowball only dealt 3~7 damage and played recently when it scales with your level.
TL;DR - Mechanics matters a lot.