Who does it benefit to rush Wilder into a fight with a more experienced and dangerous opponent? Not him because his 30 fights are misleading as to how much boxing experience he has. Not the American fans because he could lose, maybe by brutal KO, and that will set him back. Look at Seth Mitchell, he was in the convo of the three future HW stars to watch, now he's all but finished.
Wilder is also getting paid bigger money than he probably deserves and getting more exposure than he probably deserves so why should he rush it?
The fat fucks in boxing media can keep banging away on their keyboards about how he needs to do this or that, but in terms of managing his career as a big, powerful, American HW the balls in his court.