There’s a difference between weak and WEAK.
Some of my female characters may be considered weak by a few people because they’re kind and try to help, but if something is done to them or anyone they love, they won’t stand for it. They’ll deal with it in their own way whether that be reason or violence or something different. (Take Elena from Frozen Flame for example.)
However, there are other female characters that are WEAK and pitiful. These aren’t your characters that let things happen because they’re trying to be kind or have a specific reason why they can’t/won’t stand up for themselves or others. These are the characters where the writer writes them for the audience to view as being WEAK. I get what you mean about how annoying these characters are sometimes, but unfortunately, there are people in everyday life like this. (I could get onto a huge rant about how books are supposed to take people away from reality whilst targeting problems and therefore- but I’ll leave that for another time)
THAT SAID, I do NOT think people should only target girls/women in this area.
As to why more girls are writing more characters like this… I have no idea. It could have something to do with the societal pressure to do so, or the attempt at trying to display what I was talking about before but not doing it very well, or something else but… I don’t know.
Hope this helped somewhat.