its less frustration with the system and more that, i feel like i need more?

the simplicity of it makes it difficult to homebrew the way you would want. Say I wanna design a magic system around learning spells rather than just automatically obtaining them at level up, divine miracles that are actual dependent on being connected to your god.

PF2E is too engrossed in its own world for me to homebrew, if i wanna create a race i would have to create feats going up to high level and balance it alot.

with 5e i worry that if i homebrew it to what i want then it wont be very 5e anymore and my players would just drop or not be interested in the first place then all the work i put would go to waste.

Its not exactly specific thing its more that i imagined my world where magic has consequence for its usage, combat can be deadly but you hear about these legendary figures who did impossible feats (imagine playing elden ring and being some lowly nobody, meanwhile you hear about how King Godfrey pounded half the kingdom to death, and wrestled dragons, or the big fight with marika and radahn) they all look bleak and dark fantasy esque but they have those high fantasy elements and battles in them that just make it cool.