So then release Gwent on Switch and see if they make it multiplatform play.
Release Rocket League on Switch and see if they make it multiplatform play.
Release more games on Switch and see if they make it multiplatform play.
Put more pressure on Sony to do the same, not by talking but by example.
This is the only game right now that has multiplatform play.
Convince EA to make more sports game multiplatform. Convince more developers.
Again, let's talk when more games do it. This is an anomaly because of marketing.
From what I know of Nintendo, they wouldn't have any problems with this. Not sure what point you're trying to make.