Sorry, Tumblr was right here. Having Danny being Asian would have been the right call. They seriously considered hiring Lewis Tan apparently before notoriously racist then-Marvel CEO Ike Perlmutter stepped in and refused to have an Asian lead of his show. Asian actors from Daredevil have talked publically about the racist behavior of then-Marvel TV President Jeph Loeb.
Certainly Scott Buck was a big part of the problem. Can't deny it. Nothing makes this more obvious then how much better Jones' Danny came off in his guest appearence in Luke Cage. But if they had cast Lewis Tan, everybody's career would be in a better place: the show would have been better, Tan's career would be better for it, and I honestly believe that Jones' career would be better for it, too. Jones had a lot of heat coming off of a well-liked role on Game of Thrones and the creative failure of Iron Fist caused every bit of it to evaporate. In a world where Tan was Danny Rand, I think that Jones' heat from GoT gets him some other job that he is better suited for around the same time that Iron Fist happpend, and things go better for him from there.