If you have a proper surround system than usually soft dialogue isn’t as big of a problem since the voices are on the center channel and don’t share the same speaker as the music and sound effects which are on the other speakers. The problem arises when you listen to a surround mix on a stereo system or a cheap soundbar. The center and surround channels then gets down mixed into the stereo channels. Which can drown out the voices by the loud sounds since now they share the same speaker.

The real solution is adding a proper stereo mix as an option. Which used to be normal in the DVD era.