It would be helpful to allow multiple sessions. Many times I need to cut and past audio from a previous recording. That requires many steps: open old session, copy. Close old session. Open new session. Paste. Repeat.
Multiple sessions opened at the same time would be really helpful.
With the current framework it is not possible to have multiple sessions open unfortunately. It does take, as you describe, some steps.
What you could do is, place the clips you would like to reuse in the Favourites clipboard. This way they will always be at hand trough all projects.