Initial Setup Account Linking

I have an idea for minecraft: Currently, you need to log into minecraft with a Microsoft account. But my idea is that Microsoft won't be the play account anymore but instead the cross account. There will be a cross progression where you can link your play account with Microsoft or Mojang. And the catch is that you can play from every service(like google play, steam, Epic games etc.) and that will be your main account, but your linking account will be Microsoft or Mojang and it will link all you progress to other services as well