The wacky thing is, I suppose it might even be suggested they get de-rated for a plausible reason too; maybe to prevent overspeed or some kind of cavitation?
Like a lot of things in ED, I dunno whether the dev's are really, really clever and have a massively broad grasp of all sorts of scientific and engineering principles or whether they just get lucky a lot and have an eclectic user-base who can provide plausible explanations for stuff. [where is it]
I think it's a little from column A and column B.
IMO, there's a lot of relatively hard science fiction in our ships design, and when compromises had to be made for playability ("speed limits in space"), players have been able to come up good explanations for it ("FSD assisted real space flight"). You see this throughout the earliest game designs. Start with a realistic design, dial it back a notch or two so it's fun and can run on modern technology, then players come up with an explanation for the discrepancy.