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Although not exactly startup vs unlock passwords, you get similar functionality with fingerprints.

99% of unlocks can be done by touching a finger. The standard unlock code is only required after a restart or every 3-4 days.

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That's my set-up with Android now. However, on a Pixel3a, I feel like I have to do a manual input several times a day, usually if I wash my hands, use lotion, things like that. It also doesnt work well if I am outside in the cold and need gloves.

This is exactly why I learned in the tip of my nose. Try it.

Kinda gross though, and definitely not sanitary!

Can someone else's nose unlock your phone?

Only if they have his nose.

Also, it is probably possible to narrow down pin codes by looking at the surface of the phone for finger prints/screen damage. At least on Android, the unlock will appear in the same location every time and unless your pin uses every digit, there will be heavier use in some areas. It is unfortunate that stock android does not rotate the input keypad, I believe some ROMS (AICP?) would do this and thus eliminate this attack surface.

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