I've never seen a large project completed without either a comprehensive test suite or prototyping. That's why I think premature optimization is bad. We should

I've never seen a large project completed without either a comprehensive test suite or prototyping. That's why I think premature optimization is bad. We should be testing as we go. We also all understand the limits of our hardware and our abstractions we are applying to the project at hand. If we should be considered professionals we need to prove it by being able to reason about our systems. We should be able to tell beforehand what abstraction is appropriate for the project. That is the knowladge that must be taught.