There are two problems with using LLMs for writing code. The first is that when the code they produce doesn't work (which is most of the time) I still have to debug it, and now I'm debugging someone else's (or someTHING else's) code rather than my own. The second is that the work I do is very specialized (custom ASIC design) and LLMs are utterly useless.
But yeah, if all you need to do is build a vanilla app then an LLM is probably an effective tool.
But for people who prioritize precision and correctness, that's what programming languages were invented for.