My laptop has a display resolution of 1366x768. Every now and then, I’ll encounter a window whose default height is over 768 and thus won’t fit entirely within my screen. The GTK file picker comes to mind, though it is resizable without much fuss. But then there are those that cannot be resized and being unable to move the titlebar further up, I am forced to use Alt+F7 to see what’s at the bottom.
I suspect that many programs today are designed to work comfortably on higher resolution displays, but not really tested on smaller ones. Understandably, developers only have so much time and 1366x768 is getting long in the tooth. Just wanted to put this out there since nobody seems to be talking about it.
You could assume 1080p or higher for desktops, but 1366x768 and 1440x900 are still fairly common on laptops. Not everyone is running brand new hardware. Many people put Linux on their old laptops so they can continue using them. Higher resolutions screens with display scaling are also common on laptops.