At its most basic level we want the ability to launch the game in a 1 player “private lobby”, rather than then the minimum requirement of 2 players which currently exists.
A step up from that would be the equivalent to how it worked in Vermintide 2, where you get to use your other characters as the bots with whatever equipment you have on them and can choose the order in which they spawn in.
Another step up would be same as above, but you get to choose if you want the bots or would rather go without, freely select maps, configure modifiers, and overall just more control over what you’re playing.
Ideally we would get the “exclusive solo mode” i.e. hosting your own instance as outlined in the Community Update #1