Turns out Pep's the one who's a dinosaur all along..Yeah the way we use them wide is definitely out of fashion (Mbappe, Ronaldo, Messi etc).
I will about England, they did use a 343, so the wingers kind of "defaulted" to an inside role.
This is why Chelsea had success with 343 and other clubs have as well, because it fits modern football players way more, wingers playing inside, fullbacks staying wide.