For me its his total lack of boxing skills, for the reason I dont rate him. Yes he is a one punch knock-out artist but it seems he has been spoon fed fighters who he could knock out so the Americans could build him up into something he just isnt
Lets also not forget that he was actually being out boxed (i think it was his last fight before the 1st Fury encounter) and he again just managed to land his only get out clause
I will give him one thing, he had the heart to go on. But on this matter he had a corner which was full of yes-men so that the towel would not be thrown in by his corner like the 7th round of the 2nd fight
Any other fighter he comes up against now knows how to plan against him. Head movement, when he throws his right hand move backwards to reduce its power. Get in close, rough him up and bang
If Wilder does continue to go on, as we are led to believe he will then its going to be interesting how the opponent targets him