Prompt engineering and fine tuning are in many cases alternative ways to achieve the same goal. You claim that the "original GPT3" wasn't promptable. I'm unsure

Prompt engineering and fine tuning are in many cases alternative ways to achieve the same goal. You claim that the "original GPT3" wasn't promptable. I'm unsure which version you refer to, but I'm guessing you refer to text-davinci-003 and it was definitely promptable. For one app I used prompt engineering to make it behave like a spirit talking through a ouija board. For another, I used prompt engineering to make it act like a dystopian search engine from the future. So, yeah, it's promptable.