The Switch should be able to handle it unless the game was coded in some toolset where performance wasn’t a priority, because it’s only Puyo Puyo. Then suddenly it’s on a low spec platform where performance matters.

And it’s not that cross play is non trivial; it’s that it’s an ongoing expense in most cases. To justify an ongoing expense, you’re going to need ongoing revenue, which Puyo Puyo probably isn’t going to bring in.