My extraction has gone up over time purely by preference. I prefer the ritual of sitting and sipping my coffee to last a bit longer, but doing two cups is unreasonable because of price and probably health?
I used to follow the standard recipes and I see myself in the data, but I do make some very long espressos more and more regularly. Sometimes 18 in 80 out. It's a different experience to the shorter 18/40, which is more taste oriented. The 18/80 is more of a moment, rather than a beverage. And honestly, it still tastes really good.