I have many Smart TVs, all working great as dumb monitors for my AppleTVs. I wouldn’t change a thing.
Immediately thought "works for me".
I wonder if any other manufacturer offers that choice.
Edit: commercial signage panels are about as close as you get to dumb TVs these days. Rarely include any smart features, can get in quite large sizes. Not OLED or anything but if you just want a decent display...
They're good with warranty returns, but usually can't give you a replacement product due to how they do batch/bulk sales and don't keep recurring stock, so you generally end up with a refund and have to start shopping around again for an equivalent product.
As for not connecting smart TVs to Wi-Fi I read in a recent HN comment [2] that theirs connected without consent automatically to the first available unsecured Wi-Fi it found, sometime later. Seems some TVs are being extra sneaky with this.
They are mainly aimed corporate buyers, I have one 42 inch TV and one small video wall (4x42 inch) from them.