What proximity actually changes
Three things, practically. An unplanned supervisor attendance is quick, so a mid-shift question or an incident can be responded to in person rather than by phone. Equipment can be exchanged the same evening rather than at the next scheduled visit, which matters when a machine fails. And a covering cleaner can be briefed at the base before attending rather than at the site door. Each of those is a genuine advantage and none of them replaces a planned inspection.
What it does not change is planned supervision. Scheduled inspections, service reviews and periodic work are arranged the same way as on any site, because a supervisor dropping in casually is not supervision. The value of a scheduled visit is that it is structured and recorded, and proximity does not improve that. It improves the exceptions rather than the routine. Structure and recording are what make a visit supervision rather than a visit.
