I have to agree with op.
I have excellent hearing (can hear a cat walking in the night) , but I think I struggle to separate sounds in game. It’s like talking in a nightclub for me. Maybe it’s age 
I don’t hear voice chat clearly at all. But discord is 100% audible.
I think Hallowette on valkyrie is muffled.
And I often find I’m sometimes without toughness, turn around and there’s something smacking me from behind. I’ve not heard them coming or spotted the visual cue (sometimes). I do often hear the swish and dodge, but sometimes there’s no cue.
Ive posted before about enemies spawning behind. It’s cheap. It’s actually quite unrealistic insofar as : huge melee fight. Clears. Shooters nonchantly walk out as if nothing has happened.
At this point, I’m just assuming that the game /my mobo sound card can only do x number of distinct sounds, and any more are dropped.
Annoying. But not game breaking at all.