The fighter specifically has his niches he can fill, and if you want a fighter that can do those things, the Lore Warden and Tactician grant extra skills, and the Lore Warden crossed with Martial Master essentially fixes the fighter, albeit at the cost of armor.
The slayer covers almost all of the fighter niches. He is non-magical, He hit harder, he have a lot of feats, he can hit hard all day long (AKA not nova class), he can master basically every fighting style in the game (mounted combat, TWF, THF, Archery, Swoard and board, and a lot more after inner sea combat). THe only thing the slayer can not really do is to use heavy armor and that is because rogue talents mostly sucks and the ranger feat are the obvious best option.
And yet the slayer have three times more skill points. In what world can that be balanced?