It's a constraint imposed, by design, so that you view progress easily across projects. (i.e. view the progress of the frontend, backend, and UI team against a common epic)

Some of our users have extra steps in their workflow (for example, "waiting for app store review") that some of the project teams hide in their workspace (each column in the workflow can be hidden by an individual user).

In the future we might support different "departments" within an organization to allow for multiple ways of working, but it's not at the top of the list of things to do currently.