It was the same with Vermintide 2, I don’t know what you are talking about. Chaos Warriors was Crushers, Shield Vermins were Bulwarks, ragers zerkers etc.
And same as in Darktide in Vermintide 2 you took on Cata weapons/combos that can deal with them. Sienna could burn whole patrol with Ult and Famished Flames, Grail Knight can one-shot almost whole storm vermin Patrol with his ult, Long Bow/Handgun was one-shotting every single special on Cata. Handgun or Bolts Staff ignores shields. Masterwork Pistol was deleting bosses, Troll hammers was obliterating Chaos Warrior Patrols. Executioner Sword was one-two-shotting Chaos Warriors, Shade Could one-shot multiple Chaos Warriors/whole patrols. Bounty Hunter was one-shotting every elite/special and so on. All on Cataclysm.
And yet despite that power nobody ever said Cata was easy and majory of playerbase with access to all this power was never able to finish Cata run or Cata achievements.
The Difficulty of Damnation/Cata is NOT that 4 people need to co-op to kill one stupid Crusher/Chaos Warrior. That would be chore to go through map like that. It’s to be able to handle THE AMOUNT of enemies on that difficulties. When you have on Damntaion (how many of you really played it, seriously) 4 Crushers, 3 Bulwarks, 5 Ragers and 3 Reapers + 4 Scag Gunners shooting at you you need weapons that make fast work of all of them because it’s the amount of them that is danger, not them alone as unit anymore. 1 Crusher might be a threat on Diff 1-2 while leveling. But on Diff 4-5? One? That’s just a guy to kill. In Vermintide 2 on Cata anyone ever took single or 2 Chaos Warrior seriously? No. But when are 4 of them on top of 6 Maulers with 3 zerkers among horde and you hear 2 hooks rats running somewhere: that’s where the stuff gets real and you need to start spamming that Troll hammer, ults, flames, handguns etc. to kill them.
The difficulty on Cata was never in how fast you can kill stuff (you can pretty much one-shot most) but the amount of things at once that game throws at you. Same as in Darktide. When you have 3 Ralintgs (Reapers/Scag gunners), 3 Globadiers, 2 Assassins (dogs) you need people to co-op to kill them but they need to be able to do that FAST.
And the amount of damage stuff can do to you. One clan-rat on Cata from back can take half you HP almost. 3 mobs on Damnation hitting you in melee with 100% toughness can take 1/4 of you HP from chip damage. Damage and amount of stuff. The difficulty is to kill fast, control space/positioning and not get hit often.
I honestly see no difference playing with Bolter and Power Sword than I had when playing with Handgun and Executioner sword for example. It’s just what you take on Cata/Damnation.