I'm in the market for a Model S, but if I was considering a Model X, I would wish there was an option for a normal front windshield. Telsa could drop the base price of the car if the big front windshield was an option. I don't even like the look of the Model X with the giant front windshield. From the outside the car looks like it has male pattern baldness.
Living in the west of the Cascades Pacific Northwest, I often forget my sun glasses, especially when it's sunny in the winter. I did today when I had to go out. It rained just about every day last month and has been clear the last couple of days. I got used to not needing them and then remembered I had forgotten them when I got out of the hills and the sun became a problem. The sun is so low in the sky this time of year that even mid-day you might need the visor to the side when driving west, which was the case today.
I can manage this sort of situation with just the visor most of the time, but there are some times when the sun is shining in around the mirror and I have to shift position to put the sun behind the mirror.
I am also not a fan of sunroofs and never liked convertibles either. I prefer a roof over my head than the open sky. The open area over people's heads in cars seems to be a fad these days like leather seats. I don't find either very practical, but both seem to be standard equipment on just about any car with more than the absolute basic features. (Leather seats more than moonroof/sunroofs, but every car I looked at had both either standard or got added as you went up the package list.)