Phil, while you’re focusing on the Rambam, I also cited, in the same sentence, the Shulchan Aruch on it. We do pasken from S”A even if not necessarily from the Rambam. The Shulchan Aruch doesn’t pasken two times; the Mechaber only psakens that women shouldn’t go outside too much, without specifying a number. This isn’t a “fake halacha”, Phil. This is an actual Psak in the Shulchan Aruch.
What is “too much” is probably different for each woman and each circumstance. But it certainly is Halacha l’maaisa that women should not be outside unnecessarily or too much. For example, girls or women certainly shouldn’t be congregating on street corners shmoozing. This is Halacha from Chazal, Shulchan Aruch and everything in between and since.
And this Psak from the Mechaber plays a direct part for the shittas that rule that women aren’t permitted to drive.
Regarding eyesores, if you c”v saw a Jew eating a cheeseburger in McDonald’s that too would be an eyesore. Ever seeing a Jew doing something inappropriate is an eyesore.