[mattgreenrocks]

Most people don’t realize that making espresso is quite complex due to seemingly minute factors like these. When you’re pushing water through grounds at very high pressure, there are a lot of things that have to line up to get a great shot.

[nicolaslem]

Not only a great shot but consistent shots, that's even harder. I really don't understand the gripe OP has against WDT because it is really about eliminating those minute variables so that the process is reproducible.