Well, first of all, that was not me who asked that. Then, I have already explained an obvious use of a recovery mode: a lonely lambda user of Trisquel (probably most of Trisquel's users), who forgot her password, can easily change it with Taranis. With Slaine, because of apparent impossibility to boot the system, and by lack of knowledge (she is not a IT professional), she may instead go through a re-installation (and potentially lose her data). There probably are other use cases for a recovery mode.

In the case of a company/university, there is a professional taking care of the system. If she wants real security on the system, she will either lock the computer or encrypt the disk. If she thinks none of the user will ever bother opening the computer box to access the system, she may only remove the recovery line from GRUB's menu, set a password on it and another one to edit the BIOS configuration (specifying that no extern disk would be able to boot). Contrary to the previous case, she is a professional. She can do that.

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