The problem with the roadbed, if there is a genuine problem at all, is probably as a result of the manufacturing. When the cork is "cut" so it can be separated, it isn't cut all the way through. That, I'd say, is to ensure both halves remain together for packaging and shipping.

Personally, I don't see the "jagged edges" on one side of each half to be a problem. If it is perceived as a problem, how hard would it be to trim it? Or, use a sharp knife to separate the two halves instead of "tearing them apart". Or, as has been suggested - cover the edge with ballast or a little ground cover so it can't be seen.

If people are so bothered by it, don't buy it and use something else.