Did you read the comment? What do you do when you have multiple windows of the same app? Do you write the name of said program and then Alt-backtick until you get to the correct window? Wouldn't it be better to have your windows grouped in a way more related to their purpose than to the app?

For example, say you're doing something (eg programming) that requires both the browser and the terminal. While you're at that, you want to do something that also requires both the browser and terminal (eg checking something in a terminal-based todo app to reply something to your coworkers in a web based chat app). Assuming you leave these things open, you now have to do 2 switches (app switch+tab/window switch) to get to whatever you're looking for in the worst case, 1.5 switches on average.