Some effect no doubt but not as much as might be imagined by it's pressure pump like appearance. I think the main variable affected by pressure is what is forc

Some effect no doubt but not as much as might be imagined by it's pressure pump like appearance. I think the main variable affected by pressure is what is forced through the filter. A faster push and more force means more oils which can have positive or negative taste changes depending on the coffee. You see competitive aeropressers (yeah, I know...) do 60s long presses to reduce pressure. > If the pressure has no effect, why does the Aeropress brew more quickly than a French press? Typically a french press has a coarser grind and less agitation.