I also always find that outsourcing is risky, whether it's to other devs or to some AI, because it requires that you understand the problem in whole upfront. In 99% of cases, when I'm implementing something myself, I will run into some edge case I had not considered before and where an important decision has to be made. And well, a junior or LLM is unlikely to see all these edge cases and to make larger decisions, that might affect the whole codebase.

I can try to spend more time upfront to come up with all these corner cases without starting on the implementation, but that quickly stops being economic, because it takes me more time than when I can look at the code.