Just buy a dumb flatscreen. Ask for the very best quality without all the ‘smart’ gubbins, although, TBH, it might be increasingly difficult to find a modern set without it, the same as UltraHD, 4K, 8K, etc. The fact it’s there doesn’t mean you have to use it. There are good sets around from Panasonic, LG, Samsung, Sony, (they went through a period where the quality dropped off, they stopped making their own panels, but I think things have improved).
Even Lidl and Aldi do some which look pretty good value, although how they shape up against the big names I really don’t know.
I paid £899 for my 40″ Bravia seven years ago, reduced from £1400; I’ve seen a 50″ Sony, beautiful picture on demo, for £499, and I wouldn’t use any of the smart crap that’s bundled because I use a Sky box and a Mac Mini, so you could just ignore the rubbish and use your existing setup.