I believe the reason for a convex boob-armor being a bad thing was explained in-depth in the Tumblr post on the subject (which I thought was linked in the OP but it seems only an image from the post was linked). In short, an impact on the front of the armor would exert so much pressure on the sternum that it would break and the wearer would die a painful death. Even shorter, it's like your armor killing you if you trip and fall.
[url=http://martwhim.tumblr.com/post/40061546009/why-do-you-hate-the-shape-of-breasts-in-plate-armor-so]Full post[/url]
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Funny enough, that post does link a set of armor that has a place for her boobs, as it should. Because if it doesn't, it's either going to press them into your chest - creating problems, or it's going to be loose around your stomach - creating problems. It doesn't have the indent in the middle, but it does have a protruding section for her chest. But then with the dent in the middle, you're just getting into artistic freedom. (Because kratos from god of war has totally battle-ready armor)
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I do not understand the humor. Above the image you link it says "GREAT EXAMPLE OF FANTASY TORSO ARMOR THAT IS FEMININE BUT FUNCTIONAL:"
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Because everyone is saying that having a space for her chest cut out is absolutely crazy and nonsensical. And it clearly is the case with that image. That article you linked argues the indent between a woman's boobs is bad, but a hollow cavity for them is definitely a must for comfort and functionality.
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I think we're arguing the same thing and I misunderstood. Sorry.