What do you mean? He's dumb because he can RTSD?
Well, that's not all true. Most of his matchups were actually not THAT bad. Like, 5.5 and 6. But then you had the top tier which would murder him. Being defensive isn't automatically being bad or incomplete. He just had less ways to deal with zoners + they're supposed to give him a hard time anyway. If they wanted to make him more defensive without being weak they could have found ways to do that, instead of stressing his offense instead and ditching his original style.
I like CP Hakumen but I also kind of feel like he's a one combo character with that j.2C loop of his. I guess you could kind of say that with his older combo routes but he got enough damage from them without being forced to basically do that one combo or get nothing. CP Hakumen looked like he was solid middle tier until they found that one route along with OD stuff.