Abrasive soil does damage as well as looking untidy
Sand is not simply dirt. Under foot and wheel traffic it acts on a floor finish the way an abrasive would, dulling sealed surfaces, scratching vinyl and working into grout lines. In a store room with a coated slab, a season of unmanaged sand will visibly shorten the life of the finish. That makes entry control a floor protection measure rather than a housekeeping preference, and it is worth framing that way when a venue is deciding what to spend.
The cleaning response follows from that. Removal is by sweeping or vacuuming rather than wet methods that push grit around and grind it in. Mats are lifted and cleaned beneath rather than left down. Where a floor has already lost its finish, that is recorded as existing condition, since further cleaning will not recover it and the venue should not be paying in the expectation that it might.
