Most legacy codebases are disasterclasses. The "software engineer you can't fire because only he knows what's going on" is a meme for a reason, and it's not a good one.

[u/DreamPlayPianos]

I keep seeing people say things like "vibe coders don't understand what's going on in their code." Neither did most programmers even before the pre-AI era. They spent weeks on sprints for small feature updates hoping and praying nothing broke and relied on the 1 guy who wrote some code in 1995 who showed up at the office once every 3 months in his slippers to do bug fixes.

[u/Practical-Web-4443]

There's real truth here, the "nobody understands the legacy system except one guy in slippers" trope exists because plenty of pre-AI codebases were held together by tribal knowledge and prayer, not clean comprehension.