So before the Age of JavaScript, when programming was trying to be an engineering discipline, I felt like we were getting close to figuring out what worked and what didn't. We had rules of thumb (more general than Patterns) and code smells.
Then JavaScript came in and no one had time to think about "engineering" anymore. I'm fine with MVP and small iterations, but the disdain I see for making code clean and extendable and improvable is baffling (and annoying). First-time coders might never have had to fix someone else's code, but two weeks in a chair should have fixed that.
It's not that understanding code is so hard (although it can be); understanding the _intent_ is hard. This MVP is great, but when no one had time to document what is actually supposed to happen, programmers have to reverse-engineer the *design*.