Three parties are involved in one job. Whoever instructed, whoever pays and whoever occupies the property are frequently different people, and a system that records only a client name loses track of who to ring for access.
The diary has two incompatible jobs. A day of inspections produces no reports, and a full week of visits creates a backlog that arrives in the following week, which is how turnaround promises quietly break.
Writing is where the time goes. The visit takes two hours and the report takes four, so measuring capacity in inspections rather than completed reports overstates what a practice can absorb.
Files outlive the job by years. Professional liability means notes, photographs and the report itself have to be retrievable long after everyone has forgotten the address, and paper in a cupboard is not a retrieval system.