Take a look at [1] for more.

https://www.reddit.com/r/firefox/comments/c8itj2/enabling_wa...

(Same question for Electron apps, particularly VS Code.)

This is how it works on Windows as well; if the application reports it correctly supports scaling, Windows will let the application handle scaling (otherwise Windows will do it for the application, with the usual caveats).

In contrast, unless I am severely mistaken, MacOS has the application render the window normally, then applies a scaling algorithm to the output when the user has set a scaling factor (which on a Mac is set usually through System Preferences > Display) that is not an integer. (I.e., has set fractional scaling.)

I much prefer how Windows and Wayland do it. (When I use Windows, I have the luxury of free choice in the apps I use: I spend .99 of my time in VS Code, Google Chrome and a few recently-written Microsoft-provided apps like Settings. A Windows user who needs old apps or apps written by less sophisticated developers might have a much worse experience.)

In fact, I am leaving MacOS after 11 years largely because of its relatively bad implementation of fractional scaling. I find it too blurry. (If my lifestyle required the use of a laptop, I might have stuck with Apple.) But I am unusual in ways that probably make a good implementation of fractional scaling much more valuable to me that it would be to the average user.