I can see several issues that would dissuade me from using a TV. Input lag and lack of Gsync support being the two primary issues. Plus the lack of refresh rate above true 60Hz unless you're willing to fork out for a top of the line box. It's also not as easy to divide up your realestate on a single large screen. There is software available that attempts to emulate windows "snap" feature but none is flawless and they rarely play well with games or full screen video.

I went from 4k@60 to 2x1440p@120Hz and have found it to be a much more enjoyable experience in every way.