"Family friendly UI" is "ultra-advanced" stuff for me: remember, before Kodi on a Mini-PC in my living room (and, by the way, I got a remote control for it too) I had been using first generation Media Players with file-browser interfaces to chose files from remote shares on a NAS, so merelly having something with the concept of a media library, tracking of watched status and pretty pictures automatically fetched from the Internet is a giant leap forward ;)

There are downsides to being an old Techie using all sorts of non-mainstream tech since back in the 90s. I'm just happy Kodi solved my problem of having an old Media Player hanging together with duct-tape, spit and prayers.

That said I can see how Kodi having all status (such as watched/not-watched tracking) be per-media rather than per (user + media) isn't really good for families. More broadly the thing doesn't even seem to have the concept of a user.