> I am hoping I can still get a "dumb" panel the next time I need a new TV (which is hopefully never).

Protip: when you go to buy one, don't go to consumer electronic retailers - if you find a commercial electronic wholesaler (e.g. one that sells equipment for businesses), you'll find heaps of dumb TVs that are basically giant computer monitors. Same panels, better warranty, and nothing in them except a panel and a bunch of input ports.

Businesses often use these in reception areas, operations rooms, etc.