Goty
Member
I wouldn't say they got less capable on the whole, although I do think the swelling toy lines sort of bias the shows against emphasizing the ladies. So you really only get super-strong women in the newer shows when the creative team decides to make that a creative priority for the show. (Kyoryuger is a good example of this-- Amy clearly is what she is because of Sakamoto.)
In Ahim's case, she's a heart-of-the-team character, so her dependence on the others is depicted as positive. Older shows were generally less touchy-feely with the characterization, so there was narrative room for the women to be depicted primarily as heroic ideals who possess extraordinary strength. In Gokaiger, that sort of character would be out of place.
I've been thinking about that after i replied about Mei, and i kinda believe that line of thinking isn't limited to girls..nowadays, a character needs to be clearly written as strong and badass to be recognized by fans as such, while back in the day, although characterization usually wasn't as strong, everyone was allowed to be a badass, even lesser members of the teams - the fact they were much more inclined to do extended action scenes by themselves and do things like run amidst explosions probably helped to create this image, too.
I bet people would rarely list modern characters in their "badass" ranks, be it guys or girls.