That's because they're an additive tool. Everything boils down to "adding" more code. But in the long term its not about how much code you can add but how little you can get away with. But this is an impossible task for the LLMs. How would you train one not to write code? What would the training data look like? Would that be all the lines of code that haven't been written?

TDD would help here, particularly if a human writes - or at least thoroughly reviews - the tests.

https://martinfowler.com/bliki/TestDrivenDevelopment.html

Well they will train on my Claude Code sessions for a start. I spend a lot of time asking it to remove unnecessary code that was produced, I'm not the only one.

That’s not an impossible task with LLMs, you just have to mindfully architect the project with that in mind, hence take it slowly to design a good system, don’t outsource all thinking to LLMs.