I’ve come to the conclusion that Kent Beck got just about everything right with Extreme Programming. There’s just not a formal training industry out there pushing it so many more people are selling and invested in other approaches with a lot of warts.
XP is almost the opposite or shift right, similar to how every other “agile” development form pushes the necessary work forward. I think it’s telling that none of the modern software design systems seem to have given us a world where our industry is capable of delivering software on time and within budget. They’ve been around for 20 years, places follow them religiously and still fail.
Maybe everything about those concepts are just wrong? I mean, you can have people like Uncle Bob who’ll tell you that “you just got it wrong”. He’s also always correct in this, but if so many teams “get it wrong” then maybe things like clean, xp and so on simply suck?