True, but that's the easy part, there are plenty of distros one download click away. Dumb TVs or large monitors, on the other hand, are not easy to come by and/or very expensive.
I have a Ryzen-based HTPC connected to an old "dumb" TV, when that one dies, I will have to either find a store where they let me test the TV in the showroom (so I can verify that that model works with wifi turned off), or I will have to spend more and get a large monitor instead.
Alternatively I could look at "digital signage" or "hospitality" TVs which are dumb by design. However those are not easy to come by in my local market (Sydney, Australia).