The document has more than one reader
A cleaning schedule is read by a contract manager who wants completeness, a supervisor who wants to check one specific area at the end of a shift, a relief cleaner who wants to know the sequence and the access arrangements, and occasionally an auditor. Those four readers want quite different things, and a single document written for the first will not serve the other three at all well.
Producing two versions solves the problem cleanly. The full document carries the detail, the exclusions, the periodic register and the commercial terms. The single page carries only what somebody on site at night actually needs: when, where, in what order, what is excluded and who to call. Neither replaces the other and both are straightforward to maintain once the content already exists.
