Do you know that this is the case? I agree that some brand's attempts at minimalism center around removing features, but MDN's example page doesn't appear to have major dimensional changes or any obvious content absences.

Plus, improving typography and cohesiveness of design language can aid speed of navigation, when done carefully.

That said, I did think MDN's current design was both usable and modern, so it wasn't high up on the list of sites I was hoping for a refactor of...