I'd offer that the AI harness ecosystem is discovering the same thing any rapidly-growing software space did before it -- lines of code are a maintenance burden.

That's not something a team sees when they're doing greenfield, forward development. (Most projects, now)

It only crops up when they have enough on-the-books code that features / bugfixes start requiring introspection of existing code. (Now to ~1 year from now)

And a lot of these projects don't seem to be approaching codebase size growth from a future code debt perspective...