Why Doing It By Hand Is the Signal
The handcraft flex is a brag only because the machine could have done it in one line.
The signal needs the alternative: hand-brewed coffee means nothing if the only option is a machine. It means everything when the default is "ask the tool for coffee." The hand version is only a flex because it is a choice made against the easy path - that contrast is the whole statement, and the small task is just the stage.
Slowness reads as taste: in a fast lane, doing one thing slowly and on purpose is how you signal you are not optimizing everything. It is not that the hand email is better - it is that the slowness says "this one I keep on me." People read that as care, not inefficiency, and that is why it spread past the makers into the office and the kitchen.
How the game captures it: the oath is the choice, not the task. You are not being graded on whether you hand-folded the laundry - you are being read on which small things you have decided to keep on your hands, and how hard you commit to them. The card is that decision, printed.