What are the drawbacks of too much femininity?

I was watching Z Nation, and there's this group of zombie apocalypse survivors that shuns men, allows only women and children in their environment. Once a male child turns 13, they kick them out into the world. So it got me thinking.

Everybody knows the negatives of too much masculinity. Aggression, violence, harsh competition, dominance, and such.

But what are the drawbacks of too much femininity?

In particular, i was thinking of the nutrturing/compassion aspect. Can there be too much of it?