Unfortunately, a large part of "idea" end of things is validating the concept technically and communicating it with sufficient fidelity to be implemented. That's much easier when you know what the construction entails, even if it isn't you that's doing the work.

Yes, I agree. It is like trying to write the Great American Novel, without knowing how to read or write English.

Now, you could get someone else to write it, and simply tell him the details and plot points you want, but without knowing how to read English, how would you know whether the story flowed right and was succinct?

That point is usually missing in the idea vs. tech posts here. The heart of it is that you really need both skills and can decide which is your focus and which is your compass.