No channel controls? TV automatically switches to a whoever has made a better deal with the manufacturer?

That sounds like a traditional "smart" feature to me. Dumb could be a manual selection of HDMI input without scanning for the signal.

I have a pretty dumb TV with no apps or internet features, but I'll admit that the one "smart-ish" feature I do kind of appreciate is support for CEC controls over HDMI.

It makes it a bit more convenient to switch between my Roku/Switch/PC when I can push a button on the remote to have the devices ping the TV themselves.

I do prefer a dumb TV, but it doesn't have to be completely brainless.