The point about bold action is interesting, the more I think about it the more I recall dumb guys scoring points after such actions.
The two things may be connected but not necessarily, sometime being confident may even lead to a non action.
I think of confident people not picking up fights while insecure people being willing and ready to do it.
The thing about bold action is, IMO, that women tend to be passive, and thus their feminine polarity is naturally drawn to the masculine polarity (of bold action, of taking what you want).
Regarding picking fights, if you were a champion MMA fighter, a judge might well throw the book at you because your body is a weapon, even if the other person started it. That and having nothing to prove might stop someone from picking a fight. Still, a woman might be turned on by a guy's aggressive behavior simply because it's manly, even if it is based in insecurity.
It's not that I don't think confidence can be attractive, I just don't think it's the big #1 end all be all a lot of people promote it to be. You don't hear women say "I like this guy over here, he's confident, but that guy over there looks even more confident".
As you said, TRUE confidence comes from experience. Women appreciate experience, but they can also go for the false front type of behaviors, like c0ckiness, smirking, swagger, and strutting, which are more likely to be based in insecurity.
But true confidence usually presents itself as being very relaxed, because you know you can handle it. A woman isn't going to like it if a guy is nervous and stammering, asking for a date, she wants him to be relaxed and comfortable, which will tend to make her comfortable. But beyond having an easy going approach, that's not a big demonstration.
A certain amount of confidence can help a guy do what he wants to do - but that's more courage than anything, if you don't have the experience.
Also, confidence is more of a masculine trait. Even though a woman who is confident in her sexuality CAN be sexy - it might enable her to "flaunt it" in certain ways, if you know what I mean. But a little of that goes a long way in a woman, and too much can be unappealing.
I remember reading something once where a girl said that after a guy asked her to dance, he "should show his confidence in his dancing". Which I guess means he is comfortable with himself, has the nerve to get up and do it, and is comfortable doing it. I guess I can see that, but it seems more about dancing really than confidence. But I guess such women want a guy who is comfortable in social situations and can dance in a bar or at a wedding or whatever.