For there to be total darkness during a solar eclipse, they would first need to add atmospheric scattering in general. As it is now, you can always see the full nightsky while on Earth, even during the day, as if there was no atmosphere at all or as if you're floating above it. Because of that, you don't see any change of the sky during a solar eclipse.
Personally I'd really like to see a sky that changes from night to day, I can appreciate, that making something like this look good would take an immense amount of work especially with stuff like sunsets and dawns and different composition of atmospheres.