Charlie Brown,
First of all are you saying that you know that none of the leaders of any other movements in klal yisroel know or knew as much as R’ Moshe?
If you are how do you know?
Second of all,
There are plenty of things that arn’t clear cut as either the thing or situation may not have exsisted in the times of the shulchun oroch or gemara and we just depend on them ‘feeling’ (“Daas torah”) that this is what was meant by the torah.
Third of all,
by many things especialy those benogeia to science or tznius it is very possible that either they did not fully understand how the thing works or that they didnt realise the amount of evidence there is to somthing (by science things)
or they considerd somthing to flashy or crude because in the society they were brought up in it would have been considerd to flashy or crude and it has nothing to do with knowing halacha (by tznius).