[mato]

> So the biggest problem is that every optional feature you offer up does not help when someone walks into the library already locked out. The vast majority of society will never be aware of available options and features for their Google account, so it's only the default behavior that matters.

Fair enough. I live in the EU, we all have state-issued ID cards and no cultural problem with using them, so presenting those via some channel to Google would work here, but I can't imagine it working in the states.