Are you a coder? Where is your billion dollar application then? If one is so capable of building something, why haven't you built XYZ and sold it for many millions already?
If developers are so much more valuable than ideas - why isnt every single developer building something amazing?
Why is there so much crappy software, so many crappy businesses? -- I bet you'd say "well, it was a bad idea!" -- but if there is some amazingly successful company - you would say "Well, clearly that is amazing execution"
The fact is, rather, that idea folk need devs - and devs need idea folk.
I am a technical person, I design large systems and networks - but am not a developer. I am an idea guy to my developer friends - and we are always bouncing ideas back and forth.
To further your example - you are saying the architect who makes the drawings are worthless and its the contractor who pounds the nail that is the real builder.