Too many different manufacturers, too many regional favorites, or even favorites from one shop to the next. Not at all identical, and probably will shoot and tune very differently from one brand to the next.
That I definitely agree with. It would alot simpler if we had just one or two major carbon manufacturers as we do with aluminum. One of the reasons I switched from one brand of ICS carbon to another was because none of the local shops continued to carry what I was using at the time.