I don't think they move faster than the speed of light, they warp spacetime so that it appears that way. Electrogravitic technology seems to allow you to create your own inertial frame of reference "bubble" so you don't experience external forces the same way.
The light speed thing was simply because nobody has wondered how they get back home with apparently no supplies on board. So either they are cool with going to sleep for a decade and travelling at sub light speed, or they can go faster.
If you can warp out of normal space, then what does speed even mean any more?
If these craft are real and they are extra-terrestrial in origin, this has to be the answer. Sub light speed just doesn't work without cryo. Space is just too big.
Also, at light speed or even very high sub-light speed, wouldn't any collision with small debris be catastrophic? Seems they would have to be able to shift to a matterless dimension to even survive the trip.
the question of debris is part of this, if they have created a bubble outside of what we see as physical space, then debris will simply flow around it, just as light bends around a planet like it wasn't even there.
I think the idea of 'faster than light' being seen as a craft travelling at a huge velocity might be misleading, it might be that it's bending space such that it just slides into the desired location. To anyone still in normal space this seems fast, to the craft it's just repositioning the space around itself
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