macOS creates a distinction between windows and apps that Windows doesn't. Note that it isn't actually doing nothing when you command-tab to that app — it is se

macOS creates a distinction between windows and apps that Windows doesn't. Note that it isn't actually doing nothing when you command-tab to that app — it is selecting it. You can see the menu bar change. It's just not bringing the app's window to the forefront, because the window is in a different "space". If you create a second Desktop and put your app's window there, the same thing will happen.