My intuition is saying: the system arose naturally and intelligently over a long period of time, and even with its flaws has a lot of "load bearing legacy code" that few people understand, and new "engineers" think they'll just rewrite the whole thing from scratch and delete the "junk DNA" to use another metaphor. A little time passes and the beautiful clean rewrite collapses because of "totally unforeseeable circumstances" and the "old broken legacy system" is used to save the day. Somewhere a senior "monetary engineer" rolls over in his grave...

Any recommendations for books? Or even podcasts?

I don't have zero understanding. It sounds like you have a deeper understanding than I do.