I can only say it's difficult to take these complaints seriously. Are you all not making smart use of your volume sliders?
I play D:OS pretty much exclusively with friends unless I'm testing out something, and we're always using voice chat while we play. That means we're holding conversations over voice while dialogue is being voiced by the game in the background, and we're still managing to listen to each other and anything important being said in the game without issue.
We aren't having any problems with the chatter in Cyseal, and I believe that's because a) we took the time to set up our volume sliders in a way that the audio levels satisfies us, and b) we're not the type to make mountains out of molehills.
There are problems developers have to step in and fix, and there are problems that players have the tools to fix on their own, and the in-game audio chatter falls in the latter category. Having the developers step in and apply their own "fix" means changing the audio experience for every D:OS player out there that isn't currently taking issue with the chatter and isn't here on the forums complaining about it. I would really hope all of you are sincerely doing everything on your end before just demanding changes for everyone.