You've been lucky in that the countries you've travelled to all stamped your passport.

This gets much murkier in the EU, or being a non-citizen with Global Entry traveling to the US, etc.

To get a driving license in Japan without having to retake the exam, I had to prove that I lived in the country that issued my license for at least 90 days after I got it (presumably because they had some issues with people getting licenses in jurisdictions that are... easier to get the licenses in.).

This was a _very_ non-trivial thing to do for a document I first got over ten years ago, in a country that is part of the Schengen zone.

No that's what I meant - I just didn't report the countries that didn't stamp my passport. To report dates of entry and exit of every country I've visited would be impossible, I don't think I have that information at all. Quite likely in many cases nobody does.

But yeah I think the place where I got lucky is that nobody ever checked.