uhhh.. just because you don't see them doesn't mean there aren't any. like so many games on the playstore. lol. i don't know all of them at all.
Sadly no. Which is odd. You would think one company would think of it as a good idea. but thinking back on it, it wouldn't be a good game. If it was a linear game the cultivation stages would be scripted so you yourself couldn't cultivate. but if it was a game like skyrim and you could cultivate yourself, That would take a fuck ton of time. Even if sped up. The only logical thing you could do to make it work would be to leave your computer/console on all night. or have some kind of smartphone app that you can cultivate during the day with.
You can try Tale of Wuxia on PC if you want, just like it's title, it's more Wuxia than Xianxia, but you can still learn and cultivate internal energy and martial technique and it has fancy visual effect to make it feels like Xianxia magical technique ( for example 18 Dragon subduing palm will have your character shoot dragon shaped energy from his palm)
Taoists idle - write that on the Playstore. it's not perfect but it's a neat idle game that scratch that itch.