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?
I got a cheapest Android smart TV and never connected it to the internet. On HDMI1 there is Amazon Firestick for the occasional Netflix use. On HDMI2 there is Kodi for every day watching. Because of how modern TVs work, both these extra boxes can be steered with the TV remote.