Actually, there are several in-universe articles saying otherwise:
The interaction between the shields and a conventional propulsive system would be horrible (you’d get fried in your own plasma).
Therefore the Interacting Magnetic Pulse system (sorry, I’m translating back here, so I dunno if that’s the correct term in the correct in-universe article in english) actually uses some weird interaction of microwaves to create "gravitational waves on which the ship then rides", as one engineer said poetically.
The interaction between the shields and a conventional propulsive system would be horrible (you’d get fried in your own plasma).
Therefore the Interacting Magnetic Pulse system (sorry, I’m translating back here, so I dunno if that’s the correct term in the correct in-universe article in english) actually uses some weird interaction of microwaves to create "gravitational waves on which the ship then rides", as one engineer said poetically.