Don't get a smart TV, just use an external media player for the "smarts" - easiest is to put LibreELEC in a Pi and get a remoted like this.

Personally last TV I got (5 years ago) I went for something that did not advertise any "smarts" (a Blaupunkt which turned out to have some "smarts" so it has always been disconnected), though if it was nowadays I would probably spend the extra to get a commercial display - a commercial display is not only "smarts" free, it is also designed to last a long time under constant use rather than with built-in obsolescence like consumer products, so it should not need to be replaced for a long time.

I'm lucky that I've been an really early adopter of media players (well before Android TV) and quickly figure out that the life-cycle of medial players (i.e. the "smarts" in Smart TVs) is way shorter than the life-cycle of the actual display, mainly because of how often new codecs become widespread (video decoding of 1080p or higher content is only performant if done in hardware or it you throw a ton of general computing power at it), so it's economically wiser to have those things separate since you'll replaced the media player hardware much more often than display hardware, all of which is even more so when software updates of closed "smarts" solutions can literally make the device unusable simply by using too much memory, a common built-in obsolescence trick.

PS: I had a look around and above 40" 1080p the only non-smart TVs I found were indeed commercial things like "hospitality displays" and judging by example I checked from Samsung with the same spec, the explicitly "non-smart" "hospitality display" (65", 4K) was a bit over 2x the price of the "smart" consumer version.

So yeah, it's feasible to avoid smart TVs by going commercial (but costs over 2x) or be limited to the smaller sizes and resolutions, as well as simpler tech of small brands in the low-end of the consumer TV market.