If I'm going to use it instead of a console then I want it plugged into my receiver to be able to switch the TV to it whenever I want. But I'm obviously not going to leave the TV on all the time, and that causes problems. Like when the PC wakes up from standby it will randomly send a window to the TV and none of the keyboard/taskbar shortcuts can get it back. I end up having to turn the whole HT system on just to drag the window back and then shut it back down. It also really doesn't like mixing resolutions, especially having ultrawide on my desk and 4K on the TV. Regular 1440p doesn't behave much better either though. Windows change size, it likes to rearrange my desktop, etc.
Then there's HDR, which is still an abomination on PC even if you just have a single monitor and gets exponentially worse when you have multiple displays with different calibrations (or a desktop monitor with no HDR at all) or you want HDR on for the TV but off for the desktop at the same time. And that's just plain old HDR10. Dolby Vision is a whole 'nother can of worms, good fucking luck getting that to work at all.
I guess you can probably get a somewhat tolerable experience if your PC is connected to the TV and nothing else, but that's definitely not something I'd ever want to do.