Currently Taiga provides user profile based viewing and editing access to project participants. However there is lack of granular control for participants who are required only for a particular Epic, User story, task or issue.
Adding someone with specific user profile exposes the new participant to blanket access to every module of the project. For example, user access can not be limited to a only specific user story, task or issue rather he/she gets to see all the user stories, tasks or issues based on the user profile.
Having restricted access will enable external participants to contribute to the project management without the fear of exposing critical information.
