We have Plex + Netflix + YouTube (+ the Photos screen saver) as the main apps we use on the ATV4. To be fair, most of my time is spent in Plex or Netflix and it’s mostly the kids that use Youtube, but I do have a few things I subscribe to on there.
I don’t know how this compares to the iPad app? That’s where the kids tend to do a fair bit of watching, so if it’s similar to that they won’t mind so much? (I’ve only got an iPhone and that looks the same as a I remember it looking).
Another question, which I’m sure I’ll work out, is how easy it is to switch accounts? If it’s quick and easy that could offset the terrible design a little. In my household use case the ATV is logged into my account (although the kids do have their own through our Google Music/Youtube Red family account). This means that my account is crammed full of everything the three kids have subsribed to (and technically they have to live with the 3 channels I have ). If it’s simple enough to switch we could build some decent segregation of content and interests.