#4 Can't have a good match
Daniel Bryan could very well be cleared by WWE doctors to compete one last time at WrestleMania 34, especially after he was cleared to wrestle by several doctors outside of the company and is only waiting on WWE's approval, one has to realize that Bryan is going to have a lot of limitations this time around.
That means that while Bryan has been known throughout his career for his high flying offence and his insane risk-taking, a match at WrestleMania 34 would probably see none of that. In fact, the match would probably be completely devoid of his signature headbutt, his breathtaking dive over the top rope and even his running knee.
Not only that, Daniel Bryan can't exactly spend the match getting beat up due to the risk of further injury and would probably have to have a very one-sided and quick match instead. Of course, if fans want to see The Yes Lock and The Yes Kicks one more time in a WWE ring, then by all means, but it is not going to be the same as before his injury.