Honestly as someone with faily little experience in pentesting or photoshop but who has dabbled in both back in highschool. I think they would both take a similar amount of practice and skill to develop those abilities. They are complete opposites so i suspect the kind of person who is naturally good at photoshop to be bad at pentesting and vis versa. But if your going to dedicate a few hours of every day to learning a skill i dont think it matters which one you choose, a bit of time, practice, and natural interest and you will be able to do the kind of work that people ask these llms to do.

The major difference being that it usually takes longer to study code because projects can be massive but at the same time the llms are looking for everything and anything while a real attacker is usually looking for specific vulnerabilities in common libraries and such so i wouldnt exactly call the amateur hacker on par with an llm but i would say they could do a similar amount of damage without llm assistance. And photoshop is basically the same. Spend a few hours every day dedicated to one thing and you will learn how to do it.