Computer monitors have been getting a lot better while being cheaper, with no ads or services. You can get a high resresh rate 4K ips for about $200 nowadays. Display tech is just advancing faster than other tech at the moment
At this point (as opposed to a decade ago) there's arguably no difference between a TV and a monitor anymore outside of packaging and the bundling of a remote and input defaults.
Audio is a separate challenge, I'm not sure what you'd do there. Do computer monitors have eARC outputs? None of the ones I have do. Again if you had an Apple TV you could pair it with a HomePod (or pair of them) to avoid the issue but that's a niche solution.