Finally tried Smart tube...
Interface is meh, polish is meh.
But the important part: there seems to be no controls at all for touchscreen devices. So very heavily aimed at android TV users with some sort of external remote control? Open a context menu like the video one to select video quality & resolution... and just cant back out of it.
I know I know, MOST devices have a software "back" button, but my Lenovo P11 pro doesnt. Never been a problem with any other app.
Suspicious: tiling out all my currently open apps immediately shows that smart tube is opening multiple instances of itself. Like 5-6 smart tubes opened? Really dont like or trust that, see no reason for it, and Id imagine its something that's difficult for android-based TV users to verify, making me more sus about it.
Won't be using it. Already uninstalled. A browser plug-in is SO much easier to use and safer than this unusual app.