Earlier quoted context omitted.
To be honest I've never seen scaling done well. I just plugged my 32" 4k monitor into my 16" windows work laptop (both 4k), and things on the monitor are too big, even after tweaking! I have everything set to 100% scaling because that's a low as you can put it. The defaults had my laptop at 250% (!!!) and external monitor at 150%, which makes the laptop in particular look like some cramped 800x600 monitor out of 1995…
I don't know what to say here because exact scaling parameters are very subjective, but personally I find 250% scaling for 4k@16" okayish? I use 175% for 1440p@14", and 125% for 4k@27", which is slightly smaller than what Windows suggested you. When I had my previous laptop, it had 100% for 4k@16" in Linux by default, and it was causing me a pain in the eyes. Switched to 200% back then, because fractional scaling in…
I don't understand the point of a high resolution monitor that you scale up. Just to have extremely crisp lines? To me the whole point of a high resolution is that you can have more information on the screen because it remains legible when small. Why not just use a low resolution monitor, which will be cheaper, use less power, and need a less powerful computer/gpu?