One must understand that the “derech halimud” has seen many variations over the generations, and certainly over the centuries. For various reasons, learning was at times fast (one daf a day in Volozhin), slower and more focused (nashim and nezikin only) in Slobodka-influenced yeshivas, slower still in the extremely focused Chofetz Chaim derech, and blazingly fast in sefardic yeshivas. Who is right? They all are.
A Rebbe who cries over the fact that he is challenged by the breadth of shas when he spent his early learning days focused on the first perek in one of only seven mesechtas, need not cry, and his learning was not in vain. For a real lamdan, bekius should be easily attained with a concerted effort over a year or two. He should certainly know the basics of shas even from his limited scope.
So, do not despair, anyone. Just change direction if you feel the lack, it’s not too late.