I think people are overthinking this. Obviously, you don't absolutely have to have a top three receiver to be successful. But the better your receivers (including TE and RB, by the way), the better chance your QB has to be successful. A great wideout with elite speed like Tyreek Hill opens up the entire offense for the Chiefs and creates opportunities for other receivers and the running game. It's not really debatable. That doesn't guaranty your team is going to the Super Bowl (you still need a QB, and lots of other parts, including a defense), but having a top wideout definitely helps. But if the argument is that you shouldn't trade multiple number 1 picks for someone you hope will become an elite WR, then I wouldn't disagree.
FWIW, I seem to recall that a WR was the Super Bowl MVP this year.