It’s the vendors not supporting platform features. Usually, actively avoiding it because they think it’d dilute their brand or some shit.

I solved this by just pirating everything and putting it in Jellyfin with Infuse on my AppleTV. Managing profiles and parental controls (and god forbid you also want actual curation) is just totally broken if you pay money for the content, but if you pirate it, it works. Go figure. Dropped from like seven or eight streaming services at peak to I think two. It’s not worth it for the savings, though that’s a nice bonus (it all ends up in hard drives or electricity anyway, though) but it’s the only way to get sane UX. Friggin’ irritating.