What changes
Each account or campaign is a project, and the project holds the whole job: the signed brief, the scope, the production board, the version history, the client record, the delivery and the invoiceable rounds. You open the job and see the job. Nobody reconstructs it from an inbox.
A review round becomes a thing with edges. Feedback is posted against a specific version, consolidated in one place, turned into assigned items with owners and dates, and closed when the work goes back out. When two stakeholders disagree, that disagreement is visible before your team has already built both versions.
Approval and delivery are recorded, not remembered. The client's yes sits on the version it applies to. Final files go out through a share you control instead of a link that dies in a week, and you can reopen the same project two years later and find the round, the note and the file that shipped. Atty drafts the round recap, the status note and the delivery message; a human sends them.
The round is the unit of work, not the inbox
Notes from every channel land against one version, get consolidated into assigned changes, and close together. Your team stops spending the first hour of every round deciding what the feedback actually was, and stops discovering a fifth comment after the file has already been re-exported.
Out-of-scope rounds stop being invisible
Rounds are counted on the project against the scope you agreed, so a job drifting past what you quoted shows while you can still have the conversation. On top of that, the brief intake, the client records, the boards, the shared files, the calendar and the team chat are already in the product, so the stack of separate subscriptions and the manual copying between them both go away.
Every approval has a name, a date and a version
Who signed off, on which cut, on what day, and what they asked for before that. When the client says the blue was never approved, you do not argue from memory. You open the round and the record is already there, with the file it referred to.
Take the fourth account without the fourth producer
What caps a studio is usually coordination, not craft. When every project carries its own brief, board, rounds and delivery pattern, and Atty handles the recaps, the chasing and the status notes, the same team can carry more live accounts without someone becoming a full-time traffic manager.