Here is a thought: What if characters had a point budget the way a Warhammer army does? Anyone who has dabbled with the tabletop is familiar with the concept: Some things are more powerful than others so they have a higher point cost to field. That means you have to make hard choices about what to bring into battle. Even the equipment of individual models in your Warhammer army often comes at a point cost if it’s an upgrade to what the base unit fields.
Currently Darktide exists in a state of balance where everything is only balanced against the other options for its slot. That means a Plasma Gun needs to be equally desirable as a Laser Pistol. A Power Sword needs to be equally desirable as a Latrine Shovel.
If the weapons in the game had some kind of cost that cuts across slots you wouldn’t have to balance them against each other, you could balance them against the overall character build.
Even something as simple as assigning every weapon a point cost between 1 and 3 and allowing players to bring a combined 4 points of weapons into the game would drastically alter how the game can be balanced.
A Plasma Gun can now be a 3 point weapon, and it doesn’t need any silly limitations that try to bring it in line with a bog standard assault rifle. It simply is a more powerful weapon than 1 or 2 point weapons. The downside is that you can only field it alongside a 1 point melee weapon.
Bolters, Flamethrowers, Plasma Guns, Psyker Staves, Power Swords, Force Swords, Thunder Hammers - all of these can be allowed to simply be absolute monster weapons when they don’t need to be equally good as everything else that can go in their slot.
Likewise Las Pistols, Latrine Shovels, Knives, Revolvers etc. can be allowed to just be kind of bad weapons, the way they are supposed to be in the lore. The game doesn’t have to try and create parity between an Autopistol and a Bolter.
This may be kind of a weird idea, and it’s probably way too late for them to even consider adding a system like this, but I think this is the way you’d have to go if you want weapons to have their canonical power levels and really let people enjoy them without having to somehow make everything equally useful.