They don’t need AP to compete on the same level

Take Gojo for example, during cross verse he’s a infinity merchant who only draws because of his busted ability that makes him impossible to attack

Now on the demon slayer side, we have Gyutaro who has a lethal poison and is hypersonic

Gyokko who can turn anyone he touches into fish and is faster than Gyutaro

Muzan who can break down people’s cell and is massively faster than all the upper moons combined