It can work. I use my 65" OLED as a PC monitor for my HTPC. No PC monitor can possibly compare, only thing it lacks is variable frame rate. PC monitors are kind of a miserable affair, particularly IPS, which is 95% of the high-end PC monitor market. Gray blacks and terrible flashlighting/uniformity are the rule, not the exception, along with motion trailing or overshoot.
LG OLED65B7 | Yamaha v661 | Aperion 5.1 w/ SVS sub | PS4 Pro | Xbox One X | HTPC (i7-7700K, 1080 Ti, Define Nano S)
Pioneer 5020FD | Panasonic 46S30 | Hitachi P50V701