Depends on the nature of the work. In highly specialised work the junior would train with a senior while the senior can offload the easier work.

Now the senior can use the AI instead of dealing with a junior.

Plus the biggest danger I’ve seen numerous times is the junior engineer can’t easily tell if the AI is wrong.

They either accept it as correct or spend more time trying to fix AI output with an AI in an area they don’t have the skills for.