The reason I argue against the "idea guys have no worth" is the exact reason you mentioned: real idea guys have a vision, which includes an implementation strategy, understanding of what the tech is gonna do to solve the problem, how to market and sell the product, who to target, a realistic plan to build and scale, a good name for the product, an idea of what the logo and slogans should be ,etc.

An idea is way more than just one line (uber for X). My idea of an idea is insights into the market, designs for the MVP, and marketing strategy all in one.