As someone who has finished all Wuwa holograms on difficulty 6, I can tell you right now the lack of difficulty in this game is severely exaggerated. No it is not as hard as Wuwa, but it's not brain dead easy later on either. Once you reach Hollow Zero you'll start seeing enemies with fast attack patterns. The first time meeting the teleporting guy is basically seeing Tempest Mephis mob addition and is also super annoying. The attack patterns are not any slower than Mephis at all and it would be trivial for them to add enemies in later on that are the same.
So many people shitting on this game for its lack of difficulty honestly have game designer illiteracy or "difficulty" elitism. This game does a MUCH better job at introducing the players to the combat than Wuwa specifically because it is NOT difficult at the start, and even then the lack of difficulty is exaggerated. The open world and story bosses in Wuwa are just as easy as the story bosses in ZZZ. Don't let anybody tell you differently. This is a fact. Unless you've begun doing Hollow Zero (Simulated Universe) or Shiyu Defense (Tower of Adversity) any argument that this game is easy is BS. You can take infinite hits in Wuwa's open world and it won't matter at all if you have a healer on your team. Red bosses being an exception.
The dodges and parries in ZZZ are also balanced differently than Wuwa because you don't have infinite numbers of them here. Eventually if you don't balance defense and offense against harder bosses you will run out of perfect parries whereas Wuwa is balanced around having parries available at all times. The systems are similar but the balance will ultimately be different and be based on different things.
No, that does not mean ZZZ will become harder than Wuwa, but it's not the braindead easy game you've been led to believe.