The author spends an awful lot of time talking about coffee, but he seems to really be talking about coffee.
...good beans, roasted well, and prepared with a modicum of care, is all that’s ever been needed.
This is certainly true for brewed coffee, but falls flat for any kind of espresso drink. I don't have any reason to leave my house for brewed coffee though. If I'm paying $3+ dollars for my coffee, it's because I can't afford to buy a real espresso machine. And even then, the only reason I care about the skill of the barista making my cappuccino is the milk. Maybe it's just because so much effort has been put into pulling the perfect shot at this point, but I feel like the coffee is the least important part of a good milk & espresso drink. The process of foaming milk is still incredibly manual and easy to fuck up.