Agreed. If you are not incompetent, you will remember the stuff that you use often. You will know exactly where to look to refresh your memory for things you use infrequently, and when you do need to look something up, you will understand the solution and why it’s correct. Being good at looking things up, is like half the job.

I heard this somewhere: “You’re in an IVF clinic. It’s on fire and you enter a burning room. On a table is a large cooler with 5 thousand fertilized eggs, and there’s also a crying, injured five-year-old girl in the room. Which one do you save? You can only save one.” The answer for most people is obviously the 5 year old and it’s not a hard choice.