What the short list actually buys you
A fifteen-minute radius is not a limitation dressed up as a feature. It is the reason the rest of the promises on this site can be made at all. Arrival windows hold because the next house is ten minutes away, not forty. Same-week openings are real because the schedule is not padded with drive time. And there is no travel charge anywhere inside the area, because there is no meaningful travel to charge for.
A company covering the whole metro has to add an hour to every window and hope. That is the trade, and this is the side of it we picked.