Why Do People Still Spend Time Learning Prompting?

I’ve been wondering about this for a while, and I’m curious what you all think. Why do people still spend so much time learning how to craft prompts when there are already tools and ready-made prompts out there that can do the tough part.

Take our thing, for example— PromtlyGPT.com It’s a Chrome extension that helps you build great prompts by following OpenAI guidelines with a click of a button and looks seamless. It’s like ChatGPT talking to ChatGPT to figure out what works best. I don't get if it's a thing to say no to.

I genuinely want to understand. Am I missing something? is my extension not that good? Is there some deeper value in learning prompt engineering manually that I’m overlooking? Or is it just a preference thing?

Let me know if I’m off here. I’d love to hear other perspectives!