I know this a nerdish hill to die on, but I hate fractional scaling with the blazing fury of a thousand suns. To get a 1440p sized UI on a 27" 4k display, you can't just divide by 1.5x the OS has to 3x/2 for every frame. OS X does this best as they've had retina displays for a while, but no OS does this well, and it leads to all sorts of performance issues especially when dealing with view ports. Linux is especially bad.
Having said all that, I absolutely will not be using an 8k tv as a display. I'm currently using a 27" 1440p monitor, and while I could probably handle a 32" 8k display that is the absolute max size I'd tolerate. You start to get into all sorts of issues with viewing distance and angle going larger.
My 27" 1440p is fine for now. I sit far enough away from it that I don't really 'see the pixels' unless I go looking for them. It was also a crazy good deal as it's a 144hz monitor that also has a built in KVM switch that's very useful for WFH.