The problem if they had done that would be that they would have had to retrofit all existing cars:
Inside Tesla - 08.02.12
"The original beta Lighted Vanity Mirrors on the front sun visors were simply not acceptable to us from an appearance, function or size standpoint, so we rejected them and immediately started working on another solution. In the meantime, we started delivering cars. We did not want to be delivering cars without Lighted Vanity Mirrors when our
Specs page at teslamotors.com said they would be present…so we changed the Specs page to accurately reflect there would be no Lighted Vanity Mirror in the sun visors.
You will not see the Lighted Vanity Mirrors back on the Specs page for a little while longer because we are still working on getting the form factor and functionality exactly the way we want. It will be lighted, it will have a mirror, and it can easily be retrofit into all cars. In fact, we will be encouraging everyone to get the retrofit.
So just to be clear, all cars that get delivered are set up to have reading lights in second row seats and Lighted Vanity Mirrors. T
hose that don't have the latest and greatest when they receive their car can have these items easily retrofitted at no additional cost."
As far as I'm concerned, they still owe me the mirrors. I copy and paste this about every 3 months and send tesla an email requesting status on my retrofit. I of course always get the same answer back.
My wife has repeatedly said that our Model S is a toy plaything and not a real car for real people and then she points out that our beater Prius has nice lighted vanity mirrors, grab rails, door pockets, center console storage, and coat hooks.