It's still possible to write readable code and write the code right first time the O(1) complexity and not O(n^2) just by being conscious about the matter.

That is why learning essentials in algorithms and know your tools better helps.

"Just write total crap" message can be followed by many "young programmers" without any advice. It's more important to tell from the start, that there is a lot to learn.

Reading "Clean/Perfect/Beautiful Code(r)" books help beginners as well if they understand those books more like Zen and less like literal advice.