I use the TV remote control for the basic stuff. If I need to type something longer or more options, than I switch to Kore (official Kodi remote by the same developers). You just need the phone to be in the same network.
Never felt the need to connect keyboard+mouse.
I’m running a RPI4 with LibreELEC + Kodi.
YouTube runs better than the official app, at least for my needs.
LibreELEC + Kodi works out of the box with the TV Remote. And you can use Kore (android app) to get a full keyboard.
I’ll give you a hint.
The hell did I just watch?!
Voyager here. Thunder is my second, but there is a bug that the previews are not loading right. Voyager fells like a better experience right now.
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