If those actions opens tab, the user will not see the dashboard until he close all the tabs.
That is a design detail. Notebook are group can be used in the board.
Well that’s not very good practice to have a user with a lot of permissions.
Any way, with a good board design and a sparse usage of the board this should not be a real problem.
For example we could not show some actions even if the user has access to it because he belongs to another group.
But I do not want to already fix such problem of abundance before having really the problem. For now, we have no dashboard so we should not care about having too much.