You make a good point and we can see that the value of the idea increases geometrically as you move from one stage of development to the next.
A great idea described in a sentence is not "worthless" - after all it could be the nucleus of the next big thing - but it's still just a few words written down. Just not much there yet.
After experiment, refinement, iteration, failure, rebound from failure, small success, greater understanding of the problem, etc, etc, maybe an idea is worth something more tangible.
An idea described in a few words will never be more valuable than any other few words until you take it through a process of design, engineering, and overall refinement to actually realize any intrinsic potential.
A great idea described in a sentence is not "worthless" - after all it could be the nucleus of the next big thing - but it's still just a few words written down. Just not much there yet.
After experiment, refinement, iteration, failure, rebound from failure, small success, greater understanding of the problem, etc, etc, maybe an idea is worth something more tangible.
An idea described in a few words will never be more valuable than any other few words until you take it through a process of design, engineering, and overall refinement to actually realize any intrinsic potential.