Problem is the overwhelming number of spell-like abilities for every single character class and the monsters. Say hypothetically you were designing a (very-)low magic campaign. The Pathfinder ruleset is basically incompatible with your setting.
With a few adjustments to 3.5e, I could make my campaign work. I've looked into updating it for Pathfinder and thrown up my hands in frustration.
3.5e isn't much better than Pathfinder for low fantasy, I'd rather just use Iron Heroes.
I'm currently playing a limited-magic 1930's setting in 5e that works pretty well.
Does 5e allow you to level your statistics?
+2 every 4th with hard cap of 20, variant rule allows for choice between feat or ability increase.