Yeah, theere are two schools of thought. Buy an expensive super-TV and have it for 10+ years, or go less expensive and upgrade more often. The latter allows for you to get the latest new features more often. I paid $1,800 for the Sony X950G. A little on the higher end, but it will still be choice for a while, until 8K becomes a thing.
I can't remember the last time I bought a tv that lasted as my main tv for 10+ years. I mean, wifi technology has more than tripled it's speed since, more apps are available, everything has switched to streaming. 10 years ago, most tvs weren't even smart, 3D was more important than smart features, and now it's hard to find 3D.
Another thing, the memory included (allocated for streaming) has changed even with tvs within the last couple years.
There is no way I'll get locked into tech for 10 years, it's moving way too fast.
I remember my buddy spent $3k+ on a Samsung DLP almost 20 years ago, it died in 6 years, my parents and brother also spent big money on their Samsungs, all died within 5-6 years. I still have my Mitsubishi DLP from then that was half the price, and it still works (I simply swap the lamps when needed), although the Samsung chip inside was replaced with an updated Texas Instruments chip.
My main tv gets replaced every 5 or so years, and they move down the line (den tv moves to living room, living room moves to master bedroom, master bedroom moves to extra bedrooms...)