Also, the balls roll to the edge of the field, and largely towards the driver stations... Which means, that probably 25% of the balls on the field, and 50% of the nicely clustered ones are right under the drivers' noses. Where they really can't see them.
And, the Regolith (aka Glasliner FRP) curls up like no tomorrow. Despite the frequent repairs of the fiberglass tape, it's really pulling up. It also pulls big bumps in the carpet around the edges.