Comment by sciencewolf

I think I'd agree, but my argument is that going from a medium problem solved "pretty easily in a bad way" to a "fully optimized and efficient way" is easier than most people think. There's only a dozen or so patterns needed.

As an example, if you know the two pointer technique (https://algodaily.com/lessons/using-the-two-pointer-techniqu...), you're well on your way to solving at least 1/3 to half of array problems in a performant manner.