I understand both sides, really, but I'm still gonna side with the "why even bother covering the fact that DoA is about boobs as well as fighting?".
DoA is a VERY capable and fun fighting game. I enjoy playing it so much, I'm sure I've never played another fighting game so much. Its Triangle System is really fun and simple to grasp, and deep enough that only pros can really make the most out of it. If you don't believe me, try the friggin' Combo Challenges.
DoA is also a VERY sexy game. Every fighter is sexy as balls, and the costumes and boob bouncing help bring that point home. Team Ninja and Tecmo Koei promote the sexiness in the game, and work long hours to make the fighters as sexy as possible, because that is also a pillar where DoA stands.
Trying to deny the sexy aspect of DoA for appearance's sake is... futile. It's all over the place, it's undeniable, it's impossible to conceal. But it does make sense that in a public tournament that is to be streamed and all, you'd want your players to look, say, a bit less like this:
And that's understandable as well, it's one thing to know your game is hot, it's another to flaunt it freely.
But in the end it's still futile because the characters are still right there. Kasumi is still absurdly hot even when she's fully dressed. Hell, it's even obvious Hitomi has a perfect body in her clown costume. Jan Lee is still ripped and chiseled.
In the end, everybody knows that DoA is about the sexy. Showing people via tournaments that it's also about a robust battle system is commendable, but you can't do that by just denying the other part.