This post makes it sound like this is an issue that could only possibly affect 1 user, the one guy with a vertical screen running Linux with a nonstandard scaling factor. But I have the same problem (worse, even). I run a bog-standard MacOS w/ Safari machine and but I browse the web at 1.25x and I don't maximize my browser window. That also punts me into the "you must be a tablet" bucket, except I don't have the luxury of 1280 vertical pixels!
The real problem here is actually that developers make sure their site looks reasonable at the phone and desktop breakpoints, but it's rare that someone specifically designs for the "tablet" breakpoint.
Quick examples:
- https://pkg.go.dev/net/http this website is terrible to use at the tablet breakpoint, the main content is literally pushed below the fold for me
- https://neutrinojs.org/installation/ they threw away the right-hand and left-hand navigation so that they could make a page that is much too wide to read comfortably
- https://developer.mozilla.org/en-US/docs/Web/API/Window/aler... they throw away the left-hand navigation and replace it with whitespace on the right-hand side
These examples aren't particularly "rude offenders", this is just par for the course.