There are 33 plugins listed above. For those to be "official", they'd have to be supported by the OSClass developers (Juan, ect.). That's a LOT of plugins for them to have to add to their list of things to do and plugins maintain, on top of all the other "official" plugins they have.
There is a reason why anyone can write a plugin... because there is no way on earth the "official" developers could do everything. This is an open-source project, meaning anyone and everyone can work on it. If everything was just "official", there would be no reason for it to be open-source. Now I'd imagine SOME of the above ones COULD be supported, but certainly not the majority.
Just my perspective.