The issue isn't about our assumptions, but the Klingons' assumptions. As stated in the first post, "Suspicions" seemed to indicate that the Klingons themselves hold scientists in low esteem; and as I pointed out, "Judgment" pretty much said outright that pretty much all non-warrior classes in the empire have come to be marginalized and given less respect than the warriors. So it's not about whether we think warriors can be inventive; it's about whether the Klingons as a culture respect engineers and scientists. And there seems to be evidence that they don't, at least not during the points in their history that we've seen depicted onscreen.
That I do completely agree with. The onscreen appearance does not seem to suggest any respect for science. Though oddly enough Klingon Opera seems to be well respected even out side the empire?