I can tell you, it's miserable sometimes. I'm already working on v0.50–0.51, and you can't even imagine how many times I've had to roll back new content because of messy code. But with enough coffee and some random midnight motivation, it's manageable.
I mean, honestly? A lot of the time fixing shitty AI code requires knowing how the code works to begin with. I'd venture to guess if fixing code feels "manageable" to you, you are probably a much better coder than you think you are. AI coding is just faster, not easier, and certainly not more accurate.