TVs dont need to continuously improve. They just need to fall apart continuously. Which they now do. Ever own a 4k tv without problems for 5-10 years? Me neither. If you did please list the make and model as I would like to have one that is just as good as my old workhouse 1080p panel. Sony bravia I tried shit the bed and from the forum crawling I did this is not an unexpected issue. Most people seem to expect their TV to fail in about 5 years now it seems.

I have a 4K 43" TCL (model number 43S423) which has been working for 7 years. Unfortunately that doesn't disprove your claim because that would require over 10 years of service.