Your live room gets booked for a tracking session. It also gets booked for a podcast recording, because the calendar saw open time and didn't know the room was spoken for. Now two clients are unloading gear in the same doorway.
Some sessions need an engineer, some don't. Booking the room and booking the person who runs it are two puzzles that never quite line up.
Clients arrive with needs you didn't capture. Input count, gear list, how many people are coming. Without intake, you're improvising setup while they watch.