Interesringly the default DE in MOST Linux distros is GNOME which does not do what you describe, instead it follows the MacOS approach of alt-tab going through apps and not windows. I agree it is frustrating though! Have recently moved back to Windows and their alt-tab going through windows was one of the things I liked. However Microsoft has sadly enhanced it to include groups of Windows if you have stacked them side by side. One step forward and one step backward. As is the norm for modern UX.