I'm one of the crazy people who spent 4 grand on a 85 inch dumb display meant for stores to use as digital signage. Honestly a great decision. It's no home theater display but damn if it isn't just as good as any smart tv I've seen. I just have it hooked to a raspberry pi running librelec.
My parents’ Sharp has lasted more than 10 years and it’s even a smart tv, but it’s probably way more dumb than the current ones since it could only do Netflix.
Rooting an Android TV gets you there, plus you get a TV that you actually own. It's super niche and difficult to do, though. Hard to find info on which TVs can be rooted.
Is any of that information centralised anywhere? I still have and love my old dumb TV, but I want to be prepared for when I am inevitably dragged in to the "smart" era.
We managed to pick up some off newegg.ca as recently as a couple of years ago (RCA branded). Only 32-inch panels, though, so if you're looking for a living room centerpiece, you're better off going the digital signage route.