My TV i got rid off was also not smart, not invented in 2008 when i got it ( as my first ever TV ) but its build in player actually supported a range of formats, even ones often associated with pirate stuff.
No H.265 of course.
Some are now using TV as a combi TV and PC monitor + console if thats how you play, after TV hit the ability to do 120 Hz and variable refresh rate that have been a option, and not forgetting low latency for the input.
A option i am contemplating a little myself as i would like to upgrade to a monitor larger than the 1080p one i have, and also larger than the 27" it is, it would be no problem to move the computer table 1 M further from the wall and then put the TV on the wall ( one of the larger computer tables i have ) also as i am alone, well my whole apartment are more or less my man cave to do with as i please.
Only problem, the graphics card in my computer, well it can do 4K video just fine, but if i wanted to do gaming in 4K i would have to stay clear of the high graphics settings in the game settings.
1440p my computer can do very well, should be able to do 120 Hz and 120 FPS using high visual fidelity game settings
Fortunately 4K monitors or TV can be had fairly cheap nowadays, at least as long as you dont look at the very latest models, back in the day i paid 1000 USD for my TV and thats still about as much as i would pay for something like that.
But you can get something usable for a good deal less than that, i have also been looking at 1440p monitors with 240 Hz refresh rate, even if i dont really need that as i do not play computer games anymore,,,, i want to but no one make the kind of old fashioned games i like to play.