macOS Recovery: Bug or Feature?

from blog The Desolation of Blog, | ↗ original
If you enter diskutil list in Terminal, you can see that your Mac's internal disk has a recovery volume, and if you hold down ⌘r at boot, your Mac boots into the recovery volume. If you've installed multiple macOS boot volumes, either on your Mac's internal disk or on an attached external disk, you may also have multiple recovery volumes. When you hold down ⌘r at boot, your Mac selects the recovery volume associated with the Startup Disk selected in System Preferences, so you can change the recovery volume by changing the Startup Disk. Starting with macOS Catalina, the recovery volume requires a login for some reason. According to Apple's support documentation, "You might be prompted to enter a password, such as a firmware password or the password of a user who is an administrator of this Mac." The word "might" seems a bit misleading: you will be prompted to enter a password on macOS Catalina and later (later AKA Big Sur). The big (Big) question, though — and the purpose of this blog post — is, the password from which volume?