They’ve “fixed”(to a degree) hyperdensity a few times in the history of Vermintide 2. The problem is it always becomes broken again or faces issues.
They actually had a version of it working a bit during the initial WoM beta, I believe it was. People’s beef with it was that it gave the enemies more collision and it was making it difficult for players to move and dodge. It was just the way the enemies sort of moved around a player. I think that short backlash is why they scrapped it so fast that time. Getting the slot system to consistently work right has been one of the biggest thorns in Fatshark’s side.
While it’s far from perfect, it’s certainly working at least a little bit compared to pre-WoM. There are definitely attempts for enemies to “take slots”. In addition to that, the game is supposed to limit how many enemies can attack the player at any given time. The game can start breaking though and these barriers can be bypassed(such as a torrent of lunging enemies). When it starts breaking is when things really go south. I could make more demos, but I think this is adequate for a quick reply: