“Why don’t you think that a person whose mind is 95% pure Torah is better than someone whose mind is only 85% Torah and 10% Math. Would you also prefer a diamond that is only 85% pure?”
You seem to be advocating Jewish men to learn an extremely narrow chelek (portion) of Torah so as to minimize the secular studies needed. Unfortunately, I do find some of the more zealous posters to have this very limited knowledge of Torah. Basic concepts such as proven false witnesses from the Yeshivish Gemoras are foreign to them. But they are familiar with all the aggadata about heretics. On the other hand we have ZeesKite who is not obligated in learning Torah but has a wide chelek in Torah.
My best understanding of Derech HaMelech is that should be at least 32 Amos (about 50 feet) wide. For that wide a chelek in Torah a lot of outside knowledge is needed.
Zeeskite is not female