It's fine for a passenger, especially in the back seat. But as a driver, it adds a potentially bright source of light right at the top of your vision, and that can be annoying as hell. I covered my roof and I felt more relaxed since my eyes didn't have to adjust if I accidentally looked too far upwards.
Indoors, we avoid lighting a room with single bright overhead source of light. But this glass roof fad adds it to cars.
What make and model? I have not sat in a modern car where this have been a problem, ever. I drive a model 3 Tesla with glass roof and there is simple no issues with Sun glare from the sunsglasses like filter on the glass roof.
Indoors most people indeed love windows, even moreso if they are roof windows. I agree dont hang a spotlight in your face, but that is hadly the same as the Sun, otherwise how do people their houses walking, running biking without roofs?
The light is not incapacitating, it's simply an unnecessary annoyance.
People do love windows, but people also love window blinds that they close when the light points directly into a room. Especially if you are forced to face that window.
People who spend a lot of time outside gravitate towards wearing hats and sunglasses.