You can have your mirrors adjusted properly while still looking over your shoulder. I posted above that I was taught how to properly adjust my mirrors I I’ve never had blind spots, but I still always look over my shoulders - including opening my door as the Dutch do (open the driver door with your right hand, not the left, because this forces you to reach across yourself and thus turn to see what might be coming towards you and you might open your door into)
Yes, they do.
I was taught in driver’s ed back in the 90’s how to correctly set my mirrors, but apparently I’m the only one who paid attention, because everyone else did that “adjust the mirror so you can see the handle of the back door” thing WITHOUT the leaning all the way to both sides thing. It’s like it’s been ingrained in everyone’s heads without there ever being a reason, just like how we all got the idea to blow into Nintendo cartridges and it was a worldwide thing even though we didn’t have the Internet or anything to spread it around and I’m fact it actually might have caused issues.
I have absolutely no issues backing into parking spots like other commenters are saying, even though I’ve had my mirrors adjusted properly on every car I’ve ever had, and I don’t have blind spots. My twin got into my car (I say that to make it clear we are the same height and use the same seat adjustment) and she got so confused driving my car and noted that my mirrors were set so oddly, and I said “no, they are set properly”. I ended up digging out a old driver’s ed book from highschool at my parents’ house to show her how to set them and the page titled “the myth of blind spots”. She hasn’t changed her mirrors, she likes where hers are.
I’m making an educated guess that the 40,000 number is a complete exaggeration. That number is coming from Trump and Musk, not an actual spreadsheet or database. Look at by how much he exaggerated the square footage of his penthouse in Trump Tower, or the size of his crowd at his inauguration.