Introversion has published Darwinea's Design Diary. And there are very good reasons why games are not developed like this, regardless of wither you have a Manager to answer to or not. The team wasted a lot of time producing stuff that didn't work out right and the probably lost double that time by trying to make decisions later that could have been made at the start.
I have no idea why they chose to design Darwinia like this, especially when you consider that there is no shortage of good game designs out there, but the team got there in the end and I know they would have learned a lot from this.