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Can you even purchase a dumb but modern TV set? e.g. a dumb 4K OLED?

You can but they're really expensive and not designed for regular home users.

Gigabyte have a 48" 'monitor' now (an LG panel with Displayport 1.4 and no smart features)

Yes, but TVs and monitors have different purposes and it shows. A quick summary at https://thewiredshopper.com/tv-vs-monitor/

TL;DR:

- If you want a certain display tech (qled, oled, ...), you don't need this guide.

- otherwise: there is no difference. pick whatever screen has the size and ports you care about.

I expected something like distance (several m for tv, .5m for monitor), but that goes unmentioned. I guess size+resolution already cover this.

Does it come with a remote control? I expect most panels sold as "monitors" don't.

Don't most things you'd want to use this with come with remote control mechanisms? Chromecast, Apple TV, whatever you run on your raspberry pi, etc.