I have one of the most high-end TVs from LG with the most advanced native smart TV OS by far, which is webOS.
Other operating systems from rivals really feel like these TV companies, well, are not operating system companies.
And even then. tvOS is just so much more user friendly than webOS, so much faster, and the apps, while the number is sadly diminishing day by day, are such a high quality. Being able to cross-develop for iOS, iPadOS and tvOS is really helping devs out there to craft the best apps.