Full glass roof or any glass on the roof that doesn’t at least open.
Every car I’ve owned has had a moonroof, but I’ve always used them more like a sunroof, meaning, I never just have a closed window overhead letting in light. It’s either wide open, letting in air, or it’s closed and shaded, letting in no light. I’d much prefer a body-colored panel on the roof that can be opened (I really like letting in air from the roof!), but I have no use for a stationary piece of glass that can never block out 100% of light!