.....if a field like this isn't scarified, brush dragged, topdressed and cleaned on a regular basis, the surface may become dangerously hard for athletes to compete on. The field that's not maintained aggressively will look nice and new, yet may not be satisfactory for play.
In short, the new rubber infill systems require aggressive maintenance to maintain safety, yet those practices are likely detrimental to the longevity of the surface. This is the reverse of a natural turf field, which is certainly considered an investment in the longevity of the grass surface.