If you can impart enough energy to propellant to zip between planets within hours or weeks without huge external propellant tanks, and you can impart it fast enough to do it at >1 g-force of thrust, then it stands to reason that whatever you're using as an engine can probably make a brick fly without worrying too much about the rate of fuel consumption. Maybe they just stopped caring about aerodynamics, put it all on their engines, and built their vehicles for strength instead.
Needless to say, the energy density of their reactor/propellant is probably in or past the nuclear range if they can do this stuff.
An additional consequence of these super-drives should be a need for very hot, very large radiator foils.
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