"When AI is used properly" is a very very loaded statement.
Especially since evidence shows code is one of the worst things its good at, it' a lot better at other tasks.
Put another way: "LLMs are great when I don't have lots of experience in the domain but want to do something in that domain. Otherwise, my own brain works better"
Id argue it's the opposite. If you have extremely deep knowledge you can constrain the problem and get a great answer. i.e. boilerplate for X. Boilerplate is only boilerplate because you have a certain level of knowledge.
At this point, asking an LLM to "implement feature X please" is not going to give you great results. however, unless you can type at 600 wpm, an LLM doing extremely trivial boilerplate code completion is a godesend.