We have in several occasions experienced that created content in a email templates disappears - and needs to be redone. This is extremely annoying and time consuming for the content producers. There are several theories what this happens, some from you at Adobe also. Like: there is several tabs open with the same template open, or there are several users working on the same Journey and/or email at the same time.
To avoid this kind of situations where content actually disappears, we would like to have a features that lock the content to the user that has it open - and changes can not be done to the content by other than one user at the time. When open and try to change content when it is open already a warning message should appear and inform that this template/journey is blocked be user xxxxx. You can take over the editing role by overtaking the role.
What we would like is basically a build in control feature that makes it possible for just one user to make changes at the same time to emails and Journeys.