Why does 4v4 ranked , if you go into it with a team, have to be crossplay

I hopefully am not the only one but I don’t like how if you want to play with a team of 4 in ranked you are forced to play crossplay. My friends and I wanted were all on xbox to play ranked and then we saw we are forced into playing with PC players and we immediately hated playing it. Then one person asked why are we doing crossplay can’t we do just xbox and saw that its a no go for it.