Orders arrive from everywhere at once. Three or four apps each with its own screen makes a missed order during a rush a certainty, and one consolidated queue is what keeps a hard Friday night from turning into a bad one.
The dish's margin is not what the menu says. Commission, packaging, the delivery promotion that was running and the occasional refund all come off, and a line that looks profitable on paper can lose money on every order.
Shared stock needs attributing. When two brands use the same chicken, the same fryer and the same staff, knowing which brand consumed what is the only way to tell which one is actually worth running.
The platforms are timing you. Acceptance speed and preparation time affect ranking inside the app, so those metrics are not internal curiosities but the thing that decides how many orders arrive tomorrow.