The release and success of Sea of Thieves shows that cross-platform works just fine now between the Xbox and PC.
There's also at least 9 confirmed Steam-Xbox cross-platform games already: https://en.wikipedia.org/wiki/List_of_video_games_that_support_cross-platform_play
The benefits for the Xbox and PC communities would be huge! The Xbox guys are the smallest and least developed and we'd certainly love a bigger prize pool for a combined CL!!!
How easily could it be implemented? @Netheos Has there been any work done in the past to make cross-platform happen? I recall that it was a planned feature at some point.