Bash is probably the second worst thing unix has to offer, right after vi.
The command you demonstrated is only slightly faster than sorting the directory by type in a file explorer and selecting them with mouse and selecting delete from context menu, and much more dangerous, ie. when you mistype it as rm * .bak you just deleted everything in that folder permanently, whereas in a GUI you would've seen what you actually selected, and most likely only moved them to trash, not permanently deleted them right away.
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Bash is probably the second worst thing unix has to offer, right after vi.
The command you demonstrated is only slightly faster than sorting the directory by type in a file explorer and selecting them with mouse and selecting delete from context menu, and much more dangerous, ie. when you mistype it as rm * .bak you just deleted everything in that folder permanently, whereas in a GUI you would've seen what you actually selected, and most likely only moved them to trash, not permanently deleted them right away.