It's more just they're running out of monkey cards I think.
That being said, we have a huge number of existing Synchro-based archetypes already anyway. (Actually, I can't think of many we DON'T have. Yang Zing and F.A. are the only ones to immediately come to mind.)
Until Factory existed, it was useless IN Scraps, too, though.
It wouldn't be the first time we've gotten cards that were basically entirely useless due to lack of the rest of an archetype anyway. It's in a better position than cards like Mist Valley Thunderbird and pre-Burning Nova Madolche were.
Anonymous
Greymind