Why do you use a coffee press in the skill of making coffee?

Why use a coffee powder press? We all know that when using an espresso machine, the hot water is brewed at about 9 atmospheres (of course, this is not a fixed value, there are 12 atmospheres or more), and the pressure is very high when the water penetrates the coffee cake. the water is inert. What is inertia, that is, water will penetrate through the weakest part of the coffee cake, not from the thickest place. Therefore, if you do not use a coffee powder press to compact and flatten the coffee, the essence of the coffee will not be extracted, or some parts will be over-extracted.

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