If you want a serious answer, I’ll be happy to provide, but it seems that you’re asking from animosity. Still, I’ll be dan lekaf zchus, but either way the questions are valid regardless of your intention, and people might be interested to know about the issues you raise.
Re, chazaras hashatz; rav yaakov kaminetzky said that chazaras hashatz was instituted in a beis hakneses, where amei haaretz would daven together with chaverim. But in a beis medrash, no amei haaretz would daven, so there was never a full takanah of chaz”hash…still we do hoicher kedushah to be yotzei. That, together with the cheshbon of bitul Torah was bis justification for the minhag – in his Yeshiva, however, we did not make hoicher kedushah.
Re, hilchos talmud torah; there were different shitos in the rishonim and achronim in general about derech halimud, and what the yeshivos do is more about results than about ideology. It works for our generation, and that’s the main thing.