Would love to work on a project with this as a rule but I am working on a project that was build before me with 1.2 million lines of code, 15 years old, really old frameworks; I don't think we could add features if we did this.

Same. The legacy project that powers all of our revenue-making projects at work is a gargantuan hulking php monster of the worst code I’ve ever seen.

A lot of the internal behaviors ARE bugs that have been worked around, and become part of the arbitrary piles of logic that somehow serve customer needs. My own understanding of bugs in general has definitely changed.