The Rabbi's acquaintance with Haredim

1- First of all, I would like to thank the rabbi for the articles and books.
2- In my opinion, the Rabbi knew a very small part of the yeshiva world, there are so many intellectuals who are knowledgeable at the highest level in all wisdom. I will mention a few of them and would like to know whether the Rabbi knew them, and if not, then why: Rabbi Yosef Schreiber, whose scholarly thought far exceeds what the Rabbi saw in Bnei Brak, Rabbi Moshe Shapira, whose intellectual-philosophical thought is at a super high level. There are many more, but for now he has settled for them. (The reason I raise this question is because it is a shame that the Rabbi, with all his knowledge and thought, misses their high level.)