I like playing chess and have a few friends that do too but sometimes it gets a bit boring just playing chess. We all play on mobile, the app, but variants just aren’t on it for some reason. I am suggesting you add variants to the app.
Most of the variants wouldn't work well on a smaller screen and the /variants server is a completely different set of code and server. I don't know if there are plans do add additional variants to the mobile apps but it's probably unlikely.
Some can can be played via mobile browser and any in the main play server should work pretty well that way.
I like playing chess and have a few friends that do too but sometimes it gets a bit boring just playing chess. We all play on mobile, the app, but variants just aren’t on it for some reason. I am suggesting you add variants to the app.