I would agree with that.

Especially, “being 70%” finished does not mean you will get a working product at all. If the fundamentale understanding is not there, you will not getting a working product without fundamental rewrites.

I have seen code from such bullshit developers myself. Vibe-coded device drivers where people do not understand the fundamentals of multi-threading. Why and when you need locks in C++. No clear API descriptions. Messaging architectures that look like a rats nest. Wild mix of synchronous and async code. Insistence that their code is self-documenting and needs neither comments nor doc. And: Agressivity when confronted with all that. Because the bullshit taints any working relationship.