What makes Kazuya so hard

Genuine question. Everyone says Kazuya is insane tier difficulty. I get pewgf but half the time you don't even need that unless you want combo optimisation. His lows are good, mids are decent, can consistently go into heat where his stuff gets even scarier and he also get that shouting powercrush. If I try to step left to not deal with hellsweep I'm getting clipped by df2, ff2 and that other low, and if I try to step right it's hellsweep, electric, df12. Oh also i13 ws launcher that's -12 or smt. So genuinely, I need to know what makes him hard so I can abuse it and not feel helpless everytime I go against a Kazuya that kinda knows what the buttons do. I play Bryan and in Fujin, so yeh I suck but gimme some cheese strats or smt thanks.