I think perhaps it helps if we explain a bit what Project Accounts are and why we started to work with them ? I have added something about it a while ago in a different G2G and I know many people don't really understand or are still wondering about what they are for, so I will add some here as well..
Projects and Project Profiles are not just one leader or one Project leading team, Project Profiles and the Google Groups attached to them all are representing groups of Project/WT members who share their interest in a specific group of profiles or ancestors. WT of course is huge, thousands of members from all over the world and they all bumped into similar things or problems they would like to see improved or solved... so that's why Projects were started..
Projects didn't have a watchlist or something where they could see what happened to the profiles, there were no tools to protect, monitor or keep track of the profiles falling under the project. So first PPP was invented to protect and lock the LNAB field and add the message the Profile is Project protected, but even though profiles were PPP't it still happened profiles (bio''s) sometimes were ''messed up'', no cleaning up after merges, no integration of the Bio's, parents were removed or changed unnoticed,bad merges still happened and often work that had taken months or years, because of all the things that were going on unnoticed, had to be done all over and over and over again.
So the changes to hopefully improve things were, first PPP later followed by PPP also ''locking'' parents, then we had the Pre-1700 test + badge, followed by the Pre-1500 import stop + badge and the Pre-1700 Gedcom import stop.
But..Project / WT members / teams still felt like they were running around in circles sometimes and still couldn't really keep track of things, there was no project read only watch list or feed. Things were discussed a whole lot in G2G and at some point the project profile was invented and we all were experimenting at first how it could help, and experimenting we all noticed it's a wonderful tool especially for members that joined and used the Google Groups of the Project Accounts (if ... you understand what it does and is meant for, and how it works exactly and if it's used correctly)
The Project Accounts, if added to project profiles as manager, are attached to a project (profile) google group, which is actually a huge project (profile) watch list and feed we now all can share,
Projects and members can use these groups as a tool for project management and collaboration, it is a great and probably the only way, that makes it possible to share and work on all project profiles with thousands of Project-WT members at the same time, without them all added as profile managers or to the trusted list of those profiles.
Now by joining a Project and the Project Account Google Group they all are in fact co-managers, because the Project Account Google Group is actually sort of the e-mailbox of the Project Account, so all daily notifications of all posts, help requests, merge proposals can be seen and read in the Google Group by all members who joined these groups, so now they can collaborate, participate and respond or help immediately if someone asks for it in a post added to a profile or something.
The great advantage for all members is, we all can keep our own watch list within limits or reduce it to a level that is manageable for one person and all Project/Project Account Google Group members now can help manage and assist with all the work that needs to be done within the Project, without receiving tons of email, because now only the Project Account(s) that's (are) added as manager is receiving the daily notifications of requests, or posts that are added to profiles, merge proposals etc. so members now every day can just take a look at the project Google Group where all daily Project Account notifications/requests are coming in and visible.
So it is not something that's thought of by just some leaders or project coordinators or to do or have things done their way...it's meant as a tool for all Project members, and it just makes it much more easy for all of us to participate, collaborate and stay updated about everything that's going on within the Project.
If Projects have an overlap and if for some reason it's pretty much impossible to say there's only one Project that best understand the needs of these profiles, so if they are in fact equally important for a specific group of profiles, one will stay or be added to the trusted list and the project that's visible as manager will be responsible for the normal daily stuff and merges, but the big decisions are going to be made in G2G and by members of both Projects.
The only disadvantage if a Project Account is on the trusted list, is the Google Group will no longer receive the daily notifications for these profiles, but they will still receive the weekly feed, but if members really would like to receive the daily feed, they of course can join the other Project and the Google Group of that project as well or just send a request to be added to the trusted list if they are only interested in a specific family or just a few profiles .