Here's a pleasant surprise: Wargroove has crossplay.
It's got cross-play across PC, Nintendo Switch and Xbox One, Chucklefish said in a tweet regarding the game's 1st February launch. There's no word on cross-play with PlayStation 4, but that's not much of a surprise given Sony's only recently enabled it, and only for a few games so far - and the PS4 version of Wargroove launches after the other versions at some point, too.
The cross-play function for Wargroove should mean the medieval Advance Wars-style game has as large a pool of multiplayer players as possible for matchmaking, which is of course a good thing for the community and the game itself.