The arithmetic nobody does
A request that adds three minutes is nothing. Twelve of them add thirty-six minutes to every attendance, which on most sites is a meaningful proportion of the shift. That time comes from somewhere, and it comes from whatever the crew judges least likely to be missed. The original scope contracts without anybody deciding it should, and the client is receiving less of what they specified.
The reason it goes unnoticed is that each addition arrives separately and is agreed by a different person on a different day. There is no moment at which anybody sees them together. Recording them, with a rough time estimate, creates that moment, and it is usually the first time either party has understood what has actually happened to the shift. Creating that moment is the entire purpose of keeping the record.
