[Matrixbeast]

The biggest issue is that this is not really an issue of gender politics.
It's all about toy sales. It will always be about toy sales.
And when the toys of the female characters are cited as being worse than their fellow characters, then they won't get the prominent role people want them to hold.

The simple counterargument is typically "Then add more female characters. The numbers are so low because there's so few female characters to begin with." But that's not a real solution. Boys want to project themselves onto the main hero, which is a difficult issue when they don't even share a gender (Note: Difficult, but not impossible). (Most) Children aren't watching Kamen Rider for the deep, intricate story (Despite what most Gaim fanatics will try to tell you), but just for escapism and to project themselves onto their favorite heroes. By severing that link or making it much harder to connect just for the sake of a weak attempt at equality isn't worth the risks.