What has your code base ended up looking like? Is there a coherent abstraction hierarchy?

I keep checking back on LLMs every couple months and while they are now great for figuring out bugs in a system I don’t know much about (say in my use of a framework I’ve never used before), it’s been super helpful. But whenever I have it write a lot of code, even in a not huge project, it mostly works but it’s like a gum and popsicle stick machine gun and I’m scared of what large org code bases will look like in a few years.