Name me one rpg that doesn't have any errors.
We're dealing only in shades of gray here; "better" or "worse". There's never going to be an rpg that doesn't require revisions.
True - but when you factor in that PF has the benefit of using a system that's been errata'd on a system level scale twice already (3.5 / PF original release), I don't really consider PF as any worse errata wise as 4E. (I say this as someone who played both 4E and PF since release).
That said, several of my friends up here were original 4E testers, and based on playing RPGs with them, I like them very much and all, but they are not the people you'd ask to test a game for mechanics issues. >_< People would be surprised how much playtesting is basically employees of the company asking their friends and their friends' friends to test out stuff. From my observations, WotC has been much better in 5E (so far at least) about that; they have reached out to many freelancers from around the country to test in their areas as well.