So now that we're adding new hats again...

[Northadox]

Hitbox would be overpowered and make the game a lot easier not fan at all.

A hitbox visualization would just make things less frustrating. There's nothing about this suggestion that would make PR2's most brutal maps any easier maps, considering the execution needed is still their most prevalent challenge.
If this hitbox visualization was just a toggle, you could still play them just like they've always been.