I see your point. Real question: In today's world, what is the difference between a TV and a computer monitor + RasPi? I guess the biggest issue will be streaming on services with very strict operating system / browser requirements.

For example, can you stream Netflix @ 4K via RasPi? I assume no, due to super strict DRM.

It is a little bit surprising to me that the big streaming companies have not creating an open source operating system (similar to Android) that can be used by manuf to create TVs. Then, smaller manuf can find ways to offer bloatware- / adware-free options. Maybe this already exists, and this comment makes no sense!