Do you have any references for "vibe coded monoliths tend to collapse in on themselves at ~30,000 LOC"? I haven't personally vibed up anything with that many LOC, so I'm legitimately curious if we have solid numbers yet for when this starts to happen (and for which definitions of "collapse").
Just my experience in vibe coding apps from gpt-3.5 onwards (mostly NextJS or Node). In gpt-3.5, I had to really hand-hold it, getting it to write one function at a time, then a separate task to glue the functions together.
Now, it can build almost all of an app from a single prompt, but will start to rewrite utility functions, or modules, forgetting that they already exist. Some of this is still solvable with clever prompting, but if you're just attacking it without thinking, ~30,000 LOC seems to be the app 'size' that it will start to exhibit those behaviors.
