I think encouraging women to break barriers, stereotypes and expectations is always good, but describing women as their 'own worst enemy' is just another phrasing of the 'well, they just don't want to be in power' argument. It's the whole 'well, you could do it if you wanted to' thing.
Women are not to blame for the structural inequalities which hold them back. Men hold the advantage of precedent, the status quo: no, maybe nobody's giving them anything, but it's being held out with the expectation that they will take it.
Also, IMO the whole breaking barriers rhetoric is getting old. It gives this false impression of a siege line of men across the room, standing between you and the prize, when it's actually a lot more complicated, like a huge jostling festival crowd you have to push through forever and ever, people stepping on your toes and spilling beer on you (often unintentionally) and you never seem to reach the clear open space you're expecting.
It's not a question (most of the time) of being met with outright obvious sexism, someone yelling 'get back in your place, woman!'. Instead it's a slow and constant slog against a million things, many of which you might not consciously notice but which still affect you: being ignored, talked over, patronised; being the only woman in the room, being conspicuous, at odds with the status quo; being judged more on your appearance and having your interpersonal skills distorted or exaggerated (eg you're too bossy, too emotional, too flirty); being seen as dominating a conversation if you speak 50% of the time; being held responsible for other people's emotional wellbeing; being immersed in a media where a female's appearance or childbearing status are often their defining factors; growing up seeing almost every single influential figure in certain fields as male; seeing other women laughed at or torn down for being ambitious or outspoken; having kids and constantly second-guessing whether you are seeing them too little (or too much); trying to work in conditions and facilities which are designed for men; being told you're your own worst enemy and all this would go away if you just tried harder.
It just wears you down. That's what I see, in this country, more than the big man at the door shouting NO in your face: initial optimism slowly abraded into weary awareness that it's not just one barrier, it's so many things. I don't really know any more if I want to raise my daughter with this 'yay, girls can run the world!' attitude. It's more like 'yay, girls are technically capable of running the world but very few get the opportunity and that's not actually their fault, but do give it your best shot, and by the way your behaviour and success if you do reach a position of influence will be taken as representative of all future women's behaviour and success in that field, so good luck with that'. Which is a less cheerful slogan.