The gaming industry routinely deliver "large, faultless projects" within 6-9 months timeframe. Searching for "data-oriented programming" gives some hints how they do it. Another part of the story is proper project management.
Can you name any title that was developed in that timeframe? With yearly release cycles, it's easy to think they're pumping out projects in less than 12 months, but in reality each title takes years to finish, and the yearly releases are accomplished by using multiple studios/teams and pipelining.