There's so much more to being a good, productive game designer than having good ideas.
Often it is the design processes we follow, our skills we develop when working with others, that help us ship great games. How do we improve our ideas? How to communicate them clearly? How can make better design decisions? How best to deal with negative feedback? A lack of motivation?
As an industry we're not the best at helping designers improve, to develop, to grow, learn and understand these processes. To be more productive.
Helping to change this is at the core of "The Game Design Book". *
Hopefully shipping Q4 2017.
* Name TBD!