Not really? If he stays fit he is just a younger upgrade on walker

leaving the far post completely open? I imagine a player at his level will sense that and know what to do about it.

No, the way to defend him is either a fast defender and tackle him before he gets to such a dangerous position (its been done before, but requires top quality defenders), or to never let him have a 1v1 like that.

I’m convinced that Joao Felix is just an average player, he has skill but usually has low football IQ

??? His decision making under pressure in the final third was top tier this match