Fair enough. I forgot that you could apply to get both (which basically gives you a spare federal photo ID which is also good for entering Canada or Mexico). I have a Global Entry card so I didn't bother.

Not sure what the other stats are counting as passports and if they're double-counting or not.

You can also get two passport books--basically for visiting countries that may do visa stamps and which won't admit people with the "wrong" visa stamp--which is what I was talking about.

I think a bigger reason for having multi US passports is how much of a black hole sending your passport to a foreign embassy for a visa can take.

A common problem for those that do training/sales around the world for short trips.

Sometimes quite amazing how long an embassy can take when it’s one of the country’s big industries you’re heading to to train them on the expensive thing they surely want to maintain…

Although I'm not sure the degree to which getting multiple passports plays into this. Maybe it's easier to get multiple passports these days.

Pre-pandemic, I canceled a couple of trips to India for visa issues--wouldn't get back in time for other trips--although my understanding is the situation has improved.