In university studying engineering, it wasn't important that I remembered how to manually calculate all the different types of integrals, I had my calculator to

In university studying engineering, it wasn't important that I remembered how to manually calculate all the different types of integrals, I had my calculator to do that (thank goodness for the Ti-89 Titanium), I only needed to make sure I understood what an integral represented and why it was useful to me. A human's most powerful tool is abstraction because the brain is a limited resource. The only thing a slide rule would achieve for me is slowing me down, and wasting precious time and resources on something I already understood. The same reason applies to why I don't program in assembly, it would be a waste of my time for what I was trying to achieve even if it did force me to truly understand everything at a most fundamental level.