On our team we have very clear "managers" and "assignees" on every task. Wrike only has one role type to handle the users on a single task and that is "assignees". My suggestion here would be for there to be an additional role type created so that a user could be tagged to a task as a "manager". What this would allow is for greater visibility on who is managing the task (as we have multiple managers) and who is executing the work on the task. More importantly, this allows for the workflows to be created to alert the "manager" of a task upon a given status change instead of alerting a specific individual (as you can do now).
To circumvent this, we've created multiple workflows with identical status options, but have different individuals assigned to select statuses depending on who is managing the task or project. It would be great if we didn't have to do this and the workflows were built dynamically to alert the "manager", whomever that may be.