You could say that Smash emphasizes being in the air more often, but I wouldn't say that anime fighters or Marvel didn't have footsies.
To add to this, Ultimate added a shortcut to angle your shield easier by holding shield + B, or both shield buttons. It's even in the in-game tips.
You can and will block high and low and diagonally in smash because you angle your shield as it gets smaller to avoid hits getting through (or in melee you have light shields which are larger with more pushback). Once again that's not something that defines the genre. Would you call Pokken not a fighter because it has shields similar to smash that ignore high/low and break after enough hits? What about ARMS or Naruto Ninja Storm? Such a useless qualifier.
To add to this, Ultimate added a shortcut to angle your shield easier by holding shield + B, or both shield buttons. It's even in the in-game tips.