I think that while having heated discussions on redesign/changing a specification can be important, it is better to try and wrap up these discussions before you

I think that while having heated discussions on redesign/changing a specification can be important, it is better to try and wrap up these discussions before you move into actually implementing your project. If you have too many debates while actually working on the architecture (IMO too many of these debates take place at this phase, rather than ahead of time), then the engineers work on implementing one feature only to be told they must abandon it and start implementing another feature, etc. Consistency can be a good tool for keeping projects running on time without growing costs, even if the overall design is not as optimal as it could be.