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Federal law prohibits them on the driver's side in the US[0].

[0] https://wheels.blogs.nytimes.com/2010/12/30/in-defense-of-co...

Clarification: federal law permits them on the drivers side in the US as long as the mirrors also have the required flat mirror [0].

[0] same link, and the fact that my vehicle came from the US manufacturer with both.

I have a 2017 Ford Fusion with a "blind spot mirror" (i.e. a small convex mirror in the corner of the flat mirror) and I have no idea why all cars don't have them. With the left and right mirrors adjusted to just barely see the edge of the car, I have no blind spots (assuming you are careful to check the small mirror separately from the main mirror.)

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