You can replace steps 1–3 with “Open /System/Applications/Utilities/System Information.app”.

Does the MacOS shell not split at spaces, or how does that work without quotation?

That’s not a shell command (otherwise “open” would be lowercase), it’s just an instruction.

Can you explain where you type that for non macOS users?

No it's an instruction for humans

Funny, that didn't occur to me at all. :-/ Maybe that's because I'm used to the FHS and I expected a path starting with /System to be either a path that is interpreted by some command or a description of an UI flow, not a path in the file system. So the thing you would type in the shell is just '/System/Applications/Utilities/System Information.app'? Does the Finder support starting programs by typing the path in the pathbar, like MS Explorer on Windows?