Rav Moshe did not learn during Chazaras Hashatz or Kabalas Shabbos. The Satmar Rav would walk up and down his Bais Medrash closing seforim during C.H. Why does a person think he is holier because he has a sefer open? I would bet that the Ramban or the Ari-Zal etc. would not want someone learning their seforim during those time.
;