MIT Technology Review headline:
Apple Issues Strict Rules for the First Watch Apps
Starting out small and conservative is a smart way to develop a product. It's just as valid for a company like Apple as it is for a someone in his/her apartment launching a Kickstarter project. Your vision can still be grand, just don't try to do everything right from the beginning.
Developers building Apple Watch apps might be frustrated by this, but tough shit. Patience is a virtue.