I see your point, and while it is largely sensible (both ideas and execution matter), it doesn't seem to add enough because no one is really trying to argue the other side. We all agree that the idea matters, and that every now and then there is an extraordinary idea, in and of itself. The thing to remember though is that we simplify messages in life and online all the time for effect. I think "Ideas don't matter, execution is everything" is just another example of a useful (and powerful) simplification, but it's far too simple and distilled to argue about.