Who is really a Gibbor? Who is really a Kadosh?

YYA, LOOK in Rambam Hilchos Melochim (5:1) where he paskens that a Melech Yisroel is allowed to wage war to increase his renown. Ab kdei kach!

YYA,
I am glad we agree on almost anything, except a couple of technical points:
1) do we need to have observant doctors/engineers or could we just rely on goyim and secularists
2) would it be a high ruchani price/bitul zman for doing that
3) we can do great chesed with our bare hands, why do I need specialized training

On (1), you might use “charedi”, instead of “observant”, but this would be unfair – as the “charedi” might already mean the answer you prefer.
One line of answers is in RYBS yiddish article after YU created a medical school and people were up in arms – we wanted a rabbinical school, why is it expanding to medicine. The (bedieved, in the author’s words) answer was that Jews always had problems with non-religious doctors and pharmacists who were not sensitive to Jewish issues. This is not very persuasive, I think, and does not extend to other jobs, though – Iron dome seems not to need to know where techum shabbat is. So, maybe we need hatzolah/gynecologists/psychologists, but not dermatologists. But take this to the extreme – imagine all currently observant Jews become charedi, with all learning and only marginal presence of chaverei and chaveros knesset in the society. Would this be healthy? probably not. If so, then you are explicitly relying on non-charedi observant Yidden to take care of our role in society [I am inverting here your clever argument about charedi demographic contribution]. This is great – as long as we all acknowledge each other’s contribution. But if your community looks down on others [possibly because of self-preservation necessity], then this is not working.