The goals didnt mask anything they were part of his game that made him so good.
Just like Sterling was hyped, Kane was hyped, Coutinho was hyped and all about 'the goals'. Heard it all before.
Well it really depends on your expectation levels I suppose, and what you want to see of a player playing in a certain position. Is Alli an effective player for Tottenham? Yeah, ish, he gets them a decent amount of goals, but goes missing for long periods and if not scoring is basically a waste of a player (Southampton being a rare exception; in general he should create a lot more than he does.) Will he ever be good enough for Barcelona (which is really the only reason an Alli type would interest me)? IMO opinion no, absolutely not. I'd genuinely feel like crying if we ever signed him.
As to the other players mentioned, you're not asking for my opinion I know, but I'll give it anyway.
Sterling is much improved but I'd rather have Sane, Kane is the best striker in Europe (I'm not counting Messi as a striker of course), and Coutinho is a superb player, but I'm not sure where he'd fit, and he isn't priority imo, a controlling mid is.