Most TVs have an office or presentation mode hidden somewhere in the settings, that will get rid of the ad-ridden interface and replace it with a plain and functional one. That plus no wifi, ever, gets them sorted.

I bought a Hisense and it had the option during setup to disable most smart features and leave it in “basic mode”. I was already going to put an Apple TV in it so I just left it there and I’ve been happy. Only thing a tv needs is settings and the ability to change inputs.