It's not a rock. The original poster probably didn't remember correctly, but he was referring to a discussion regarding the "Cobblestone Girl", which is an artist specialized in cobblestone modeling/texturing (I have no idea how factual this actually is with regards to Square Enix). The discussion on WAHP wasn't so much about how they wasted time by assign people to do such specific tasks, but rather about the deliberate inflexible policies implemented by Japanese management to prevent employees from being able to seek employment at other companies. If an employee's only skill is cobblestoning, then it's less likely she would be able to leave Square after they train her (to cobblestone) and go to another company.
The side effect, of course, is that everyone is so specialized the structure is too rigid to accommodate necessary changes when changing development methods.