Ive repeated this before
MO is a broader spectrum that charedism, Basically people who are charedi do not differ much in relgious observance from each other. and if you veer from that, you either leave, or are kicked out.
MO is alot more of a broader range of relgious observance, They use Shabbos and Kashruth as the baseline. If you keep those 2 things, they consider you orthodox and from there the observance varies from women who wear pants and do not cover their hair to people who basically are charedi, but might wear a kippah seruga during the week and wear more western dress