In many ways, I am a "bottom feeder" when it comes to TV's.
I had a Panasonic Plasma and it was great, but when it was time to upgrade to a larger screen (by over 50% if you calculate area of the screen - which is what matters),I have no regrets. Unless you are too close to the screen, bigger simply outweighs refinement (although we would all prefer both). My ex got the Plasma - aside from the furniture, our deal was everything upstairs aside from audio gear was hers and the basement (my woodworking shop) was mine.
In the last decade I have bought (or advised people who bought) Sceptre, Sharp, Element (these three qualify me for my bottom feeder comment),TCL, Vizio, and Samsung. I have never had a TV reliability problem in my life aside from a Mitsubishi CRT! It was a relatively advanced/expensive unit.
My thinking on this is if you are buying something like a TCL or Vizio (or Element or Sceptre or Sharp) they are not pushing into the "bleeding edge" of new technology and you will be fine for reliability. That said, the Sharp used Roku (which is why I bought it),but they did a poor implementation where after a few firmware upgrades the connection between the modem and the Roku took too long to connect and I ended up adding an external Roku. But the TV works fine!
The big advantage of the TCL is that it uses Roku (and implements it well) which is superior to any other Smart TV interface I have seen. If you plan to use an external streamer (which I would recommend),this is not a big factor. With TCL, I would plan on adding a Roku (or Fire Stick) in 2-3 years. Historically, for me, that is when buying a new one has yielded enough performance/feature improvement to justify the upgrade. Obviously you would not upgrade your TV after 2-3 years, so that is why I don't really like the idea of smart TV's (and the fact that it doesn't cost much to upgrade the streamer).
I guess I should add that I do not watch too much TV. My GF does and she has had Element, Sharp, and TCL. These have all seen steady use (they have migrated to her kids/grandkids as she up-sized) without any issues!