Generally extracting oil slowly is a good thing, it increases the total amount you're able to pull out of the ground. Increasing immediate flow means having to

Generally extracting oil slowly is a good thing, it increases the total amount you're able to pull out of the ground. Increasing immediate flow means having to do things like pumping water into the field to increase pressure, and getting an increasingly watered-down mixture back out. Things that involve a pretty huge increase in complexity.