What are you talking about? So many games have the ability to transfer stats and cosmetics over different platforms. Hell, even the new Call of Duty (AN ACTIVISION-BLIZZARD GAME) has cross progression.
The only reason they have not implemented this is because they want you to spend more money on loot boxes. That’s it.
BUT DO NOT WORRY GUYS. JEFF KAPLAN IS BRAINSTORMING A SOLUTION. EVEN THOUGH THIS WAS A YEAR AGO.