To answer your question we might want to examine the gemara on 28a of brachos which says that Rabban Gamliel wouldn’t let anyone into the bais medrash if he was not “???? ?????”.
#2, you may want to remember that on the day that when Rebbi Elozer ben Azaria became Nossi, and abolished this rule, many many benches were added to the Beis hamidrash.
There are many many Mishnaios and halochos that were established “Bo BaYom” – which means the day REBA abolished the rule. how many Mishnaios, Midrashim, gemoros, Rishonim etc etc and learning forever was accomplished when that rule was abolished?!
If it proves anything, it proves precisely the opposite of your assertion.