I minimise them quite frequently these days for something I want to tuck away. A good way to surface them is the "App Exposé" feature (Preferences -> Trackpad -> More Gestures). Shows all the hidden windows for the current app.
It's different to Windows though. If they're looking for something more similar to Windows, maybe Command+H (hide the active app) is a better alternative.
It's an alternative, but in windows minimizing works on a window, not the entire app. The philosophies of [apps] vs [windows] are just too different, I don't think anyone that wants windows can be happy out-of-the-box, with the apps vs windows thing plus with the minimizing being basically "putting the app to sleep" on macOS vs "putting the app away" on windows.
It's different to Windows though. If they're looking for something more similar to Windows, maybe Command+H (hide the active app) is a better alternative.