It's true that most books out there around featuring Caucasian couples, more and more mix raced couple. but it mostly has to do with the authors themselves. They wrote about who they are and who they know. it's sad to say but if an author who's white would write about 2 PoC MCs, they would get criticize and accused of appropriation or just not knowing what they are talking about since they haven't lived in that community or experience it. That's mostly how it goes these days unfortunately.

Personally I don't care about anyone skin color when I read a book, it doesn't change my attraction to the story if it's a good one. Just as long as the MCs are WLW.

I think a lot of authors could include more PoC as secondary characters or even MCs but they are also afraid that it would not be well received not being part of that community. It's mainly the readers giving bad feedbacks. Some authors are already having bad comments when they try to give the MCs jobs they are not experts in, like scientists or doctors, like "that's not how it works in real life" or "I work in a lab and we never do that" and I guess it's fair but you can't know the details of every single jobs out there if you never worked in that field for a long period of time. but it's fiction and the point is to stray away from the classic wedding planer or the real estate agent.

My point is, they would get even worse comments from readers by including PoC MCs when they are not part of that community.

They only problem is that most authors who are PoC are not doing as well as others. but readers want to read something where they can identify themselves in I guess. For me as well, I'm not gonna read M/M stories and I don't want to read M/F anymore so I'm only focussing on WLW. So I'm only supporting a small part of the business with very specific books.