I wouldn’t feel comfortable in a shul where women are leading kabalas shabbos. I’d feel a lot less comfortable saying that a breach of tznius or kavod hatzibur is worse than a breach of halacha.
In any event, I think it’s completely within reason for the RCA to take the position that they will not allow members to allow their sense of morality determine halacha but will allow it to help them determine what is kavod hatzibur.