Hard lesson learned the hard way ;) Abstracting and clean coding around seemingly abstractable and similar fresh code (or even existing one!) without knowing the details that lead to that (agreed, often also not the best craftswork, but anyway) or the near future, is often the culprit of the later big tangled mess to be.

Also really, not just refactoring someones code without talking, but just pushing? Not even a PR? Imagine a workplace where everybody does this the whole time, lol. The boss asked for a revert for many good reasons ;)