‘scuse my flower. If Rabbi Miller ??”? said it, I’m not sure you’re the one to argue.
And RationalFrummie, (VERY RATIONAL), not that you need my humble input, to me it sounds like the correct answer.
The Gemarrah, in a lot of places alludes to the fact that at Matan Torah there was ???? ????? ??? ?????, complete purity of the mind and thoughts. So at that conjuncture there was no need for such to be instituted.
Not so when ANSHEI K’NESES HAGEDOLAH felt the need to institute it – and backed their innovation by pesukim. So no, there’s no reason to mock our tradition of mechitzos nowadays. No – society has not improved since.