Uhhh, this might be true if you just look at moege, but in better plotge, some otome and much of yuri you'll easily find female characters with actual agency and whose actions have clear moral weight. The picture is not this black & white. Just don't expect a "breakthrough" when it goes to typical eroge - those games are like this because they cater to very specific needs of a very specific audience, and deviations from the formula rarely pay off for them.