[SahAssar]

Setting the bar at "spacecraft that humans have ever flown in" seems very restrictive to what experience you count.

That'd be like saying no one can talk about websites in the same way because we probably only have at the most 9-ish "successful" social media services. The list also mentions many things that are learned from non-human space flight programs, or non-successful programs.

Is everything in it true? Probably not. But from an outsider perspective it seems to contain some insights that most definitely are. I think of it sorta like https://www.stilldrinking.org/programming-sucks is for devs. Cynical humor that contains a lot insights.