> Why you can’t toggle between different instances of the same app by default is beyond me.
I’m not entirely clear on what your requirement here is. Historically, Mac OS X/OS X/macOS has had a different app and windowing model compared to Linux. If you’re looking to switch between windows of a single app, you can use the keyboard shortcut Cmd + ~ (that’s Command and tilde). There are also trackpad gestures to see all windows of an application (swipe down with three or four fingers) and switch.
Why you can’t toggle between different instances of the same app by default is beyond me. But hey, we get more emojis!