The famine is created during the feast
When the studio is full, outreach stops. Three months later a project ends, the calendar opens, and the pipeline has to be rebuilt from nothing at the exact moment there is least confidence and most urgency. That cycle is what a background sender fixes — not by sending more, but by never stopping.
A low, constant pace also protects the thing studios worry about most. Twenty-five specific emails a day does not read like a campaign to anyone receiving one.