Any app can has its extensive set of keyboard shortcuts, but when it comes to DE itself, it's not always the case.
replyMicrosoft has Meta+ and Alt+ combinations dime a dozen, and it's consistent across versions. KDE has extensive programmability which allows you to design you own. Both allows you to pack so many features into a small number of keys and work across applications or in general without thinking.
A terminal? It appears. A window? You call it without thinking. Ran out of space, a new desktop is just an instinct...
On macOS you can also assign a keyboard shortcut to any tool menu the app exposes. This works without the app knowing about it.
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