The other thing is nobody likes working on problems that don't challenge them. They want to work on problems that are +1 level above their current skill. The pr

The other thing is nobody likes working on problems that don't challenge them. They want to work on problems that are +1 level above their current skill. The problem is that the 'first solution' they developer/engineer is very likely to be shitty (and they probably won't even know how or why its shitty) purely because they're not experienced. Ideally you want 'seasoned vets' for whom this level of engineering/development is old-hat and have them churn out a solid product that handles all the edge cases that you only know about when you have a long-term experience with the technology/domain.