Niki said that in the cultivation world actually fighting for example 2 or 3 realms above is actually possible but we won't be able too. It's not just that our cultivation is slower
Its all about placements

For instance, the ph of those wu traitors was also a ph and I'm sure MH with gs would still win a fight against her
But we're so high that we won't even get to see those bums always places to fight the strongest
If we were to fight ai missions we'll clear it low dif
Buh if ai was to fight even one of our fights or mission?
She'll be cooked
So don't expect wu heir to start fight in 2 stages immediately after leaving poma