How do you think they trivialize it? I've found them to be good for writing short scripts or answering a specific question. I've never seen one that you point at your own code base and have it do things like write a new endpoint that takes into account all the existing database and authentication code. If such a thing exists I'd like to know about it.
Your first sentence is describing the web based LLMs. There are others that operate against the project structure and has read all the files. But a lot of CRUDs also involve a much easier modular ___domain structure.
LLMs amplify you quite a bit in productivity if you're doing CRUD which is what most people are doing. You just clean up the code and clarify potential improvements.
