Ideas have value, and someone who can unite people with a clear vision can do incredible things but the implementation is a big part of the actual difficulty and usually you have to update the idea as you learn more from the implementation.
In general I suspect the implementation is usually harder than coming up with the idea in most cases and fewer people can do it. (Exceptions might be things like General Relativity and initial Bitcoin paper).
Still, obvious value in trying to come up with things from first principles.