Why do video game soundtracks lack dynamics (variability in loudness and softness)?

Question

In many JRPG and platformer video games, dynamics in their soundtracks seem to be completely taken out of the equation. Why is that so?

In: Other

Answer 1

I recall reading that video game music is best for productivity, as it’s designed to keep the listener engaged without being distracting. That may have something to do with it.