You kid, but you kind of touch upon something: far, far too often when people discuss media, "diverse" is synonymous with "black". If your lucky, it'll mean "black and hispanic".
I have, kid you not, encountered people who would make extensive arguments for why an all black cast is "diverse".
Anyway, this is tangential, so I will repeat the actual on-topic comment I've had for a while: Danny Rand is one of those characters for whom their whiteness is actually a character point. Firstly, because of how he is a man who doesn't belong in both Kun Lun ( where he's a white dude ), and in NYC ( where he's a guy from Shangri-La ). Secondly, because of how his personal friendship with Luke Cage works, vis a vis him being a privileged rich white guy.
Changing him to be Asian-American kind of wrecks both character points, and the logic behind doing so has a whole bunch of unrealized racist undertones ( notably: "Asian-American is the same thing as white, they don't get to count as a minority", which is really precious coming from people simultaneously arguing for how oppressed Asian-Americans are by Hollywood ). This is not like swapping Johnny Storm's race, where his character is almost 100% indifferent to ethnicity.