What do you call it...

...when someone has a technical problem, and they have managed to deduce that there should be a solution, and even what the outline of that solution might be, but...

the major obstacle to their solution is that it requires someone competent -- in precisely the ways that they have shown that they are not -- to execute it smoothly?

They drew a wheel, but they don't know how to make one.

If it happens for existing solutions, how often does it happen for original ideas, which are then shelved because of poor or non-existent execution?

What do you call it...

...when someone has a technical problem, and they have managed to deduce that there should be a solution, and even what the outline of that solution might be, but...

the major obstacle to their solution is that it requires someone competent -- in precisely the ways that they have shown that they are not -- to execute it smoothly?

They drew a wheel, but they don't know how to make one.

If it happens for existing solutions, how often does it happen for original ideas, which are then shelved because of poor or non-existent execution?