This is the problem with metaphors. They get misunderstood and misapplied.

I didn't mean a general direction, I meant a specific one. Like a telephone is different from a cellphone. Landlines have only so much potential. You may attribute cellphones to implementation, but someone had to figure it out.

How many millions of man hours would make AirBnB worth more than Groupon? Not the best example, but I'm sure you get it. Ideas have limits, but so does implementation.