title_body: Does an inconsistent roast affect espresso extraction? If so, how?
upvoted_answer: That's a tricky one.
  It depends on what do you mean by 'extraction'.
  
  &quot;Coffee extraction is the process of dissolving soluble flavors from coffee grounds in water&quot; - from Wikipedia.
  &quot;Extraction is everything that the water takes from the coffee&quot; - from BaristaHustle.
  &quot;To remove or take out something&quot; - from Cambridge dictionary.
  
  Therefore, the extraction process considers dissolving the flavors. An uneven roast will affect directly the flavours on the final beverage. Thus, even the perfect extraction will not be able to extract all the flavours it could if the beans weren't correctly roasted.