> Having memory of how to do things and techniques and tools and patterns is absolutely important for solving problems. The very reason experienced engineers are just better at many classes of problems.

At least in my experience, the best engineers have a vast catalog of problems and solutions, algorithms, architecture patters, data structures etc and almost nothing comes from scratch. The worst engineers do everything from scratch without much/any understanding that the problem they are facing (or a variation of it) has been solved before in 6 different ways with varying tradeoffs.