Knowing how to set it to require a passcode feels like absolutely important information if you're a political dissident, a journalist with valuable sources, if you live or are visiting somewhere where the police will harass you (or worse) for your private lifestyle, if you're employed by a corporation with trade secrets the government wants to spy on, or of course if you're just a straight-up criminal.

But if you don't fall into these and similar categories, then it seems totally fine to rely on biometrics.

Because this isn't at all a case where just because I have nothing to hide, means I'm cool with eroding privacy protections. The point is that you can protect yourself when you do have something to hide. But me relying on convenient biometric unlocking isn't preventing those who need to disable it from doing so. It's not even making them seem more suspicious, since my iPhone asks me to verify my passcode every couple weeks anyways, or every time it restarts.