Tecmo apparently used the Dead or Alive engine for this game and didn't think this would be detrimental to the atmosphere of the horror game they were making. Other design and story choices are kinda dubious too. It's just annoying because this series didn't use to be like this
that looks to me like she's getting snapped 180 degrees because of animations or the camera fuckup, but it's been a while since i've seen "extra bounce" on doa 5.
Trying to decipher how this is supposed to be arousing or titillating in any way whatsoever (not that that's what you're supposed to aim for in a horror game). Comically-large breasts I can kinda understand but this...
Jiggling boobs and related things like panty shots in video games have a long history, especially in Japan, going back to hand-animated 2D arcade games. I think it's just horny hetero cis male nerds designing and animating female characters and putting all of their fetishes on screen.
While I guess there's some initial basis in reality "boobs are squishy and would respond to movement" (at least if no bras are involved) video game boob physics have basically evolved into an artform of their own far removed from the real world. Gamers expect boobs to be big and to move noticeably.
It gets funny when everyone has the same exaggerated physics regardless of what they're wearing, like in this game. Even if a woman is wearing standard office attire with a blazer there's still a mini earthquake happening in her chest everytime she takes a step. The only exception seems to be full traditional kimonos worn with obis.