EXPLANATION ABOUT "EASILY GUESSABLE"
If you need to learn about it, it is not easily guessable.

Examples: /bin, /etc, /usr (= user?), /opt, `/dev (= development?), ....
Counterexamples: /home, /binaries, /Applications, /libraries, /devices, ....

It's been there for 30 years? Big fucking deal. If the folders were named /fo, /pk, /cnf, /wut, or /lol, you'd cope the same way, by learning. It means that hundreds of valuable hours are wasted every time an UNIX newbie must learn about it.

Thank you for your attention.