I hear you, but I’m not an example of this. I have a Pi-hole set up, firewalled my phone, happily use LibreWolf, etc.
Besides that, I also want to do the research on what screen to get. If a worse screen (small one, monitor or digital signage) is the only acceptable solution, then that’s what I’ll pick – but having some idea of what it would mean to pick a typical smart TV and try to limit the consequences is also something I want to consider. The only frustrating thing to me is that it’s hard to find out details about this (and that includes details about digital signage screen quality, for instance, since businesses don’t seem to care all that much).
I currently have a similar setup, but with a very old TV (that served me well for 16 years). Not easy to find good dumb TVs these days though.