I am in the exact same boat, 2x scaling at 4k. I am young but I wear contacts that are not an exact perfect prescription due to the limitations of contacts.

But people will swear up and down to me that there is no way I could possibly tell the difference between screens.

You can literally see individual pixels on a 1080p screen!

I am on Macbooks, but I want to switch to something with Linux so I am waiting for the gen 9 Thinkpad X1C with 4k screen to be available at some reasonable price.

Font rendering is also clearly worse on Linux than Mac, making the fuzzy pixels even more unworkable. I dual booted a 2015 Macbook Air into several Linux distros and I could barely read the text no matter which settings were applied.

More relevant to the overall thread: Pop OS is awesome.