> And to bring this back on point, to my very specific original comment, the poster I was responding too said this wasn't "hidden behind a keyboard shortcut" when it most definitely was

I'm that original poster. The comment I responded to was clearly referring to holding "ctrl" in order to save to clipboard, not referring to the screenshot ability itself (which as others have mentioned, is not hidden behind a keyboard shortcut, but is an app in Applications/Utilities)