I thing that's because the cockpit is meant to remain on the same orientation, allowing the ship to manuver without putting extra gs on the pilot.
How does that make sense in 0 gravity where you have no orientation and your guns are drastically changing firing angles while your ship is constantly moving about you? Damn it b wings, can you see what you made me do? You made me try to bring logic to Star Wars!
How do TIEs make that horrifying scream in space? o_O