is anyone else annoyed that in the Win11 era you can no longer double-click the top-left corner of a window to close it (like you could basically forever)
[I mean it still works in Win11, but the point is that apps using "native"-styled windows are rapidly becoming a minority now, and when they implement custom titlebars they do not implement this anymore.]
back when Office 2007 got ribbonified (and more relevantly, CSD-ified) they specifically kept the top-left corner reactive to this, despite having been replaced with the big round "File menu" button otherwise, and it still works in Office 2021
but third-party apps don't bother, Firefox just has a completely useless corner there, as does the new tabbed Explorer, Chrome, iTunes...