GAW: You have somewhat of a point about Rebbetzin Jungreis, but Rebbetzin Tarshish is influential in her sphere. I didn’t go to her seminary, so I can say that what she says has nothing to do with me.
However, the whole “If a rabbi says it, it goes” mentality means that if a rav says something, it’s taken a lot more seriously.
Think about it- it’s all the mindset. Be honest with yourself- would you listen equally, as a gut reaction, to a rav and a rebbetzin?
Paradoxically, though, that’s why I don’t think that female Orthodox rabbis make sense- because most Orthodox people won’t buy into it, making the whole designation worthless. It’s just inflation.