That part wouldn’t bother me so much if there hadn’t been significant tech changes between Phantom Menace and RotJ, or simple ways of greatly improving performance. It’s plausible that eventually technology development necessarily slows down due to some fundamental limits. If you’ve had hyperdrives and they’ve barely changed in millennia, then no way could Han have the galaxy’s fastest ship, no matter how good a mechanic he is. You also wouldn’t have new generations of star destroyers totally outclassing their predecessors after a few decades.
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