I don’t fully subscribe to the notion that we need to approach coffee-making as scientific as possible because I find a a big part of baristaring is art.
But then I realized that we use the 2-group Astoria Plus 4 You TS at the cafe and a clear shot glass with red measurement indicators. So it’s easy for me to say that coffee making should not lean too much on the scientific side.
The powerhouse espresso machine we use actually have a lot of the science done for us.