This couple that was in the same train as me, left their seats to change the diaper of their little baby.
Not only did they go away from their luggage, but they left two phones and a large tablet visible and unattended for quite some time!
It’s like this in (non-major city) Germany, with one exception: if you blink before locking your bike up, it’s gone. I’ve seen laptops in public areas sit undisturbed for hours, but almost everyone I know has had at least one bike stolen.