Why unwritten splits fail slowly
A volunteer who has wiped down the kitchen after every gathering for six years is part of the arrangement whether or not anyone wrote it down. When they stop, the task does not transfer, it simply disappears. Nobody decided to drop it, so nobody notices for weeks, and by then the standard has shifted and the contractor is often the first to be asked about it.
The same happens in reverse. A contractor who has been picking up an extra task informally for a year has created an expectation that is invisible in the scope and unpriced in the fee. If the arrangement changes, or the cleaner changes, the task stops and it looks like a decline in service. Both patterns are avoided by naming who does what, once, in writing. Writing it down also removes the awkwardness of asking, since the record describes an arrangement rather than making a request of anyone.
