Crossplay for H5 PC and Xbox One for customs?

Being that the whole idea for Customs is a “just for fun” thing, why hasn’t there been crossplay for the custom browser yet? Customs is dead on the PC side, and I prefer playing Halo on PC. Would definitely make me play Halo 5 a lot more. To be honest, ever since the customs browser came out I haven’t touched matchmaking or warzone at all. To me all the fun for Halo is playing the insane gamemodes the community comes up with.