I wouldn't say that. I've met with many types of sub women and they aren't all like that. At least half of them are not. Thank you Dark Gods, i love you, for giving us not just braindead fuckdolls! x'D
But seriously. Dominants can't do much with a lifeless blow up doll either. It sure annoys the hell out of me when i meet one and i leave them well enough alone with great haste. Honestly, this is more like a specific fetish. Some prefer braindead fuckdolls and trust me, some subs have the fetish to become one! Its alright this way

But its not true that they are all like that. For example i like subs whom i can have a normal conversation, who initiate stuff their own. Like.. any normal person. Its totally lackluster otherwise having just a doll... I'm dominant but i love seeing sub females with personality in games too. I love turning a woman into a sub the most. Because i'm a corrupter. And this, to a degree, means exactly that the more complex, the deeper her personality is the more i'm tempted. If i would have to choose between a naive, saintly but very simple girl... and a headstrong, authoritive ceo type of woman with sharp intellect.. i'd choose the latter 9/10. And i'd expect her to retain her wits even when i made her my lewd lustpet!
But this is just me. Truth is, no dominant or submissive streaks are the same. We all love different things, different approaches. The problem almost always stem from that people instinctively prefer to generalize. So if they think a dom should be asshole they think all dom should be one, is one. If they think a sub is a braindead vegetable, they think all should be one, are one. The truth is, thankfully, that this is much more colourful and not just black and white like that.
We are getting way too serious here though :happyblush