alt Hacker NewsI have wondered this about an open source project I wrote about a decade ago [1] and still use. It's an order of magnitude less popular than Monica at 1.5k stars.
The code base and logic is complex enough that it's hard to fix bugs and add features nowadays since they're few and far between. The test coverage is the only thing that makes it remotely possible.
I've considered doing the same, rewriting it so that AI can reason about it better. I think it would be a net positive compared to where it is today. But it's also stable, as I mentioned, so I don't have enough motivation to do it.
Just saying, I can see myself doing what this person is doing.