I'm not a designer, but lessons #3 and #4 are particularly good.
When I was around 10 or 11 years old, my father offered me $10 to move a cord of recently-delivered firewood from the driveway into the garage and stack it up inside (I am old; $10 was a great deal of money back then). I managed to get all the firewood inside but rather than it being stacked against the wall, it was more or less evenly distributed across the floor of the garage. I expected my payment, but instead got some advice: “Every job you do has your signature on it — do you really want to sign that?” I always remembered that and if I am going to do something, I make every effort to do it right. (I also properly stacked the wood afterwards, even though it took forever, and I got paid in the end.)
I used to play in a band. Other people might have played team sports, or worked in a well-functioning restaurant. There’s something about working deeply, in real-time, with other people that’s both incredibly satisfying and enormously more effective than working alone. You need to be open for the pass, you need to hear the subtle rhythm shifts, you need to spot when someone else’s table needs the check … everyone should be taking account of what everyone else is doing and constantly modifying their own behaviour to better serve the team.