I have a NVIDIA Shield which has a really great television viewing interface from Google which integrates FAST services like Tubi, Pluto, Plex and such that looks a lot like the UI from a cable box.
My understanding is that it hides the "video on demand" aspect in that it creates a "Death Note channel" that like a linear TV channel that plays nothing but Death Note.
That Shield was my introduction to FAST but I installed most of the same apps on my XBOX ONE because, for the last three months, I'd had the project of gentling a feral cat which is partially an excuse to watch TV and play video games in the "Cat Room"
though lately Bob B has been coming down the floor (finally accepted me as his person) and pointing at the TV to register his disgust with what's on it. (And no, I didn't watch このすば 3 on Tubi!)
I was visiting my 75-year-old father who's struggling with memory issues last week. He has an awful time working his TV - he has Roku, but he can't figure out how to use it and if you show him, he'll end up forgetting. I was thinking this would be a great market for older folks who don't want or can't use "smart" TVs. Even YoutubeTV doesn't offer a way to "flip through" channels.
The Shield is pricey but I think is the only decent Android streaming device.
Flipping through channels is problematic in the digital age (even digital cable or ATSC) as it can take a few seconds to start a new stream whereas NTSC could sync up within just one frame,
Can't speak authoritatively on this, but I think same catalog is shopped around to other free or semi-free providers, like Roku or Samsung TV+.