I skimmed that article earlier. So you grind coarser and put less water through? So you end up with less espresso? That’s not going to cut through a 8oz milk drink. Might work in the med where people drink espresso but not in UK where people want buzzy milkshakes.
Two interesting article - @StevePeel , could maths make you save 25% of coffee by grinding it coarser??
https://www.theguardian.com/food/2020/jan/22/maths-experts-secret-perfect-espresso
https://theconversation.com/how-to-make-the-perfect-cup-of-coffee-with-a-little-help-from-science-129398