As originally created there were a lot of dud perks in Skyrim because of the game's own balance. That's what I didn't like. Melee perks wrecked, stealth perks were so good they made the game boring, there was tons of kruft in spell casting perks, and a shit load of grinding in the blacksmith and forging perks. Perk choice was like "Ok, do I want to deliberately make the game easier or chip away at a mountain of grind?" There's still some of that going on in FO4, but, there's no grinding, it just happens as you play, and two there's more fun effects at the various levels or effects that at least contribute to the game. You're not as stuck into perk requirements as you were in Skyrim. Part of me is sad that character building is literally reduced down to one screen. On the other hand, since I've given up on Bethesda as really wanting to make satisfying, crunchy mechanics, at least they've quit even making the attempt and doing it half-assed, and streamlined their own brand of mechanics in a way that works for the kind of game they're actually making. Nothing is sadder than seeing obligatory, vestigial RPG mechanics in a game series that has long stopped seeing them as important.
We'll see when the next Eldar Scrolls drops. I've accepted it for FO because it's its own series, has always been lighter on mechanics than ES games, and I accept the triviality of a lot of it due to the branding (S.P.E.C.I.A.L, Vault Boy, etc...) I don't know if I'd enjoy an ES game that has de-emphasized the RPG side of it as much as FO has. But in FO4, "it just works."