Comments of chapter undefined of Seeking Immortality In The World Of Cultivation

After seeing that it takes thousands of failed attempts and tens of years to learn to refine an elixir, I'm really starting to doubt the mental capacity of these cultivators. Are they all generally complete idiots that are unable to learn from their failures? Do they really not figure out how to improve after one or two failures? Do they just have one or two brain cells in their entire head?