Why is that surprising? Nintendo is trying to establish partnerships to do anything to triumph over the failings of the Wii U. They even went so far as to sacrifice the use of their own network with Minecraft, giving Microsoft complete control over online accessibility instead. Microsoft is trying hard to one up Sony anyway they can, which is why they’re pushing so hard for crossplay this generation while they shut down prospects repeatedly last gen.
Although it would be nice if crossplay wasn’t simply dictated by how successful the generation leader is, that just seems to be the way of it. A push for crossplay has developed as a method for those behind instead.