My parents are getting a new tv, and are asking for recommendation. I think all I can influence is the brand/model (not realistic to propose rpi and more complex systems). I instinctively avoid google/android and lean towards anything else open source, so probably LG WebOS… But I had bad luck searching for more detailed comparisons. Maybe you have experience or opinions?
But you can just block all the ads on the home screen with pihole. Then you can still use the native TV apps. It’s a win-win.
If you turn off Internet access then your parents can’t stream.