If the bugs remain unfixed for decades, then they were clearly not important or impactful enough.
Plenty of them annoy millions of people but there wasn't any budget or time to fix it.
Is 130 million dollars impactful enough? [1]
[1] https://www.reddit.com/r/Bitcoin/comments/1vddeuy/are_you_ki...
The LLM changes the cost-benefit analysis. It lowers the cost of fixing papercut-level issues to the point where they make sense to fix.