"We demand the devs go to considerable effort to animate the boobs naturally so that we can't notice the results!"Like I said. I'm not asking for ridiculously bouncy here. Just asking for realism. As for the question: Of course they move. Depending on the clothes, they move an awful lot. You don't notice it because you aren't paying attention, but then you probably aren't paying attention to animated chest hair, bulging knuckles and popping veins either.
Any girl adventuring with a Wonderbra instead of a sports bra isn't a heroine I could relate to.