True but there are multiple ways of doing something. So after thinking about an idea, finding the easiest way to implement it is also a task in itself.
I'm not smoking anything, thank you very much for your polite inquiry.
How you came to the conclusion that "If the implementation is too hard, the idea was worthless", I can't even begin to think.
Difficulty of implementation and worthiness of idea are totally orthogonal.
There are tons of very important ideas that had a very difficult implementation. E.g the idea behind the atomic bomb was very valuable despite the fact that the implementation took some of the top minds, several years and millions of dollars.
