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"The Boot partition will also have to carry an emtpy "efi" directory that can be used as the inner mount point, and serves no other purpose."

You could substitute Boot for Root in this sentence and flip it around on Poettering.

The root partition already contains a set of empty directories, and Lennart has been working on reducing those where possible (see usr-merge).

It just feels like such a small thing that is not even worth mentioning or taking into account.

I prefer to think that Poettering doesn't know mkdir exists. Eagerly awaiting systemd-make-directory-automatic@.path.