I use a triple monitor setup with the LG 24UD58-B. 24", 4K, $300. 2X scaling is absolutely perfect on it. 27" is not a good monitor size for this, I agree.

As an aside, a user here recommended putting the outside monitors in vertical mode with the middle monitor in horizontal mode. It works extremely well for reading websites/documentation/terminal output while coding in the middle panel.

> Fractional scaling is a mixed bag and a lot of apps have broken or compromised UI when it's in use.

I use 1.5× scaling in Sway, and haven’t observed even the slightest problem in any Wayland app. (I also use the high-DPI patches for XWayland, and run it at 3×, so that it’s an integer multiple of my scaling factor, a minor visual improvement on the very few X11 things I use that is probably not worth it.) I will note, however, that Firefox is rendering content at 2× and downscaling; setting the experimental widget.wayland.fractional_buffer_scale to 1.5 distinctly improves rendering, but had some very annoying bugs when I tried it several months ago which became debilitating maybe a couple of months ago, so I gave up on it.

Ummm, I think 274K on 200% is definitely fine? I just use it as 1080p with better text rendering and graphic. I don't even use it at 150% because that at a 50 ~ 60 viewing distance isn't really a pleasure experience. Did you place the monitor very close to your eyes?