[Lindby]

You can get dumb panels if you look into the b2b offerings. These are ment to be mounted in various business settings (show commercials in the checkout line in the grocery store etc). Often they don't even have any speakers, but the normal builtin speakers are crap anyway. A chromecast or android tv box and a sound system and you have yourself a smart TV setup where each part can be upgraded separately.

The downside is the price and inconvenience (as a consumer they are not easy to find). Buying a consumer grade smart tv is usually cheaper than buying the same panel as a "panel only tv".

[iwasakabukiman]

I'd also imagine that the image quality is pretty terrible on those compared to a comparably priced OLED TV.

[sleepybrett]

Price for these units is prohibitively expensive.