Imagine you can take your old android tablet that no longer holds a charge unless plugged in ( say a HP Touchpad, Fire tablet, cheaper walmart brand ones etc) and wall mount them in you kitchen.
Imagine there are generic $5 bluetooth remotes that let you channel flip ( between netflix hulu youtube etc.)
Why is this not possible I wonder.
There are a lot of reasons.
Leanback UI would scale like shit on a tablet. You literally wouldn't be able to read the titles on media. The entire UI would need to be overhauled to make it remotely usable.
You'd have to compile it for the specific device. Especially no tablets supporting Project Treble (as far as I'm aware), so that's a big pain.
Google Nest Hub was made for exactly this use-case and they're $100 right now . So not extremely expensive and requires very little set-up.
Other than a just being a cool project (or you're really in the poor house and you already have the tablet), there's not really any reason to do this over a Google Nest Hub.