the feel argument has a lot of weight to it, we aren't generally willing to sacrifice everything including feel and looks in the name of performance.
for example g&g's speedsoft abominations are a case in point where the design has been made entirely without compromise towards making them as practical for effeciently slinging plastic downrange as possible and yet the result is something very few regular airsofters would want to buy.
the same applies for example with a polymer bodied g3 or m249, lots of folk would dislike them because they don't feel right, regardless of the fact that a lighter gun is better practically speaking than a heavier counterpart.
i do agree with lozart's philosophy that once you're happy enough with the internals of guns, you tend to preferr exterior quality over performance purely because you know the latter is something you can sort out.