As a rule, I disagree. The research pace can be too slow in a OCC. Getting other towns up does hasten research, which gets one to the possibility of better wonders earlier. Also, other towns can have some workers join to the OCC for faster growth or development in that city.But that is again asking for an OCC for as long as cultural buildings are buildable and abandon the OCC-principle later on.
You might be right on Tiny Chieftain or something though where research cost is rather low.