How about the fact that "your stuff" is not algorithm. In 99% "your stuff" is to pick the right library

You could just ask "do you know when quicksort becomes quadratic?"

> Just use a "Library".

Not just a library, a battle tested one.

A bad implementation of quicksort can be much worse than "accidentally quadratic" bad.

a good library could shuffle the array before sorting it and never be quadratic.

Or has hints about quadratic behaviour in the documentation.

A good library could automatically choose the best sort algorithm for the input.

For example Java used quicksort for primitive types and mergesort for arrays of objects.

now it uses trimsort for both.

But the developer just calls `sort` on the collection.

> How about you know your stuff .

I bet you never encountered quadratic quicksort in your life.

   The probability that quicksort will use a quadratic number of compares when sorting a large array on your computer is much less than the probability that your computer will be struck by lightning!