I'm not sure the Switch has the power to do 2 different 720p screens. Not on relatively demanding games anyway.Easy fix: put an active USB hub in between.
And USB C hubs aren't that cheap.
Well, not really. The gamepad was also a controller, which your phone is not. The gamepad and Wii U were also connected through a proprietary modified wifi that I imagine isn't as cheap as regular wifi, in order to reduce latency. The phone could display a map or some other passive screen, but that's about it.Like most wiiu games
The only one that comes to mind is Wonderful 101 and people were pretty divided about it. Pikmin 3 was pretty good but I don't think it's irreplaceable.Justify this by showing me a good game where the second screen was an integral, irreplaceable part of the experience.
Other games displayed maps/inventory, or straight up mirrored the tv screen, so yeah I'm not sure why anyone would want this honestly.