which is indeed a very weird hill to die on.

Also because its perfectly plausible to have Black, Brown and Asian characters in positions of power. For example House Valaryon which the wealthy black characters are from, are extinct in the later GOT series and hail from Valerya as is house Targaryen. That is why they both rock the platinum do's. In the original series (GOT) most Black/Brown/Asian people resided in the Free cities which is the general direction of the ruins of old Valerya. Also in that time people from that area mixed with Westeros and were in Old Town (where the Maestres are from, like the maester in HOTD) as well as King's Landing.

Furthermore George RR Martin was supposedly more involved with HOTD than GOT, so he would also approve of this casting and changes that would have bene made.

So yeah decolonize yourself if you have a problem with this