abelleh – you wrote “I just follow the Rambam, Ramban, Meiri, Malbim, Megilat Esther, Aruch LaNer , Ramah, Sforno, Rav Hirsch, Rogatotchaver, Chazon Ish, Rav Yosef Dov, Rav Shacter, Rav Willig, Rav Lichtenstein, Rav Twersky, Rav Aharon, and all the other gedolim who believe that science has value”
what you write is almost humorous. you mention someone like the Chazon Ish. do you know who he was and how much of his time he spent learning?? they say about him a story that he once had to crawl into bed at night because he didnt leave enough strength in him after he finished his learning to walk to his bed. we all know he knew science, but it was not from taking courses, thats for sure! he learnt it from the torah. and you mention the Rogotchover. someone whom they say didnt stop learning for a minute! whatever science he knew or learnt was totally Lishmah.
and you mention Rishonim. like the Rambam. first of all, we are not discussing learning for parnassah, since a person can learn carpentry or plumbing and in regard to parnasah, they are all a mitzvah. and if you are discussing the wisdom of hashem, you didnt read my post so well. of course if you are on the madreigah to learn science for the knowledge to understand hashem better, or to praise him, or to understand how the human body works for learning purposes, or to keep yourself healthy – -thats a mitzvah. but lets be real. no one does that nowadays. maybe someone like Rav Avigdor Miller, or those that read his books. but no one goes to classes for that.
and when you wrote “something of value is not bitul torah”. if its not torah and not for a mitzvah it IS bitul torah. now i am not saying its possible to never be mevatel torah, and i am sure 1000% i have done so as well, but lets call a spade a spade.