My initial reaction was as follows:
Blasian protagonist: Because representing one minority isn't enough anymore.
My major problem is that the source material doesn't actually *have* these races. Hylians are consistently portrayed as WHITE. Arguably Renado from Twilight Princess had a touch of Native American to him, but he's still basically white. Races are shown via the races of Hyrule, meaning the Gorons, Zora, Deku, and Gerudo REPLACE blacks, asians, and all the rest. Only the Gerudo are recognizable as humans with a different skin color. Ironically, what little racial tension there is in Hyrule is between the two most similar races: the Hylians and Gerudo.
This also explains why we seldom see mixed races in Hyrule: it's basically literally impossible.
And, in it's defense, that's actually a remarkably progressive message if you consider it in its own terms. Our world's differences between skin colors comes out as a trivial affair indeed when you're interacting with side characters who eat rocks or are literal fish people. In this universe, humans are almost exclusively white because having a lot of racial variety within humans isn't the point, so as long as Link is recognizably human he will be recognizably white, too.
In universe, if you were GOING to make Link another race, it would be one of Hyrule's native alternate races. That won't happen, in part because players would feel very odd playing Zora Link for an entire game, but mostly because humans are balanced to be able to fully explore the world of Hyrule. Most of the other races have places they can't go. That argument from gameplay alone will Drumpf any political message.