I can’t remember where I read or watched this, but the argument was that the main problem with a lot of software is simply code base size. Once your code base is large enough , it can no longer really be understood as a whole which leads to performance issues/bugs/vulnerabilties. I think that’s just an unavoidable part of large software.
Agentic engineering is probably not helping since it tends to accelerate growth of LOC. I also personally think quality is an issue as well but it could be a skill issue on my end idk.