Earlier quoted context omitted.
What keyboard combination do you use to switch between all windows of all apps in one single UI? (Note: that keyboard combination should also make sense on ISO keyboards and be available without third-party apps)
There are a few other options for doing that -- the two that come to mind: if both hands are on the keyboard, the standard Command-Tab combined with the down arrow key allow you to cycle through both apps and windows of a single app. Better though, a simple three-finger swipe up on the trackpad show all windows as thumbnails for easily getting to the window you want from any app. I use the latter constantly, saves ti…
macOS has a lot of keyboard shortcuts, and you can add even more from both apps and Applescripts