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The threat model of someone looking through your window is significantly different than the threat model of someone googling "default password for XXXXXXX".

You are correct, but we shouldn't let perfect be the enemy of good.

It's a step in the right direction. The effort required to look through every window in one city is a lot more than scanning every router owned by an ISP globally.

All ISP's routers in the UK for maybe the last 10 years haven't had weak default password and I've never once seen them print it in an easily visible place. It is always on the bottom, and a few years ago the started adding cards with it on.

If anyone who will be within plain sight of the router should not know the password, then obviously you should not use the default password that's printed on the router. You should set a new password yourself.