Feel free to disagree, but think of it this way: ideas are possibilities. Until they are attempted, sometimes repeatedly, they are in-flux.

It's the same as the concept of "desire" vs. "intention" vs. "goal" vs. "reality". Ideas without work put into their execution are still in the "intention" phase. Yes, they are boundless, but practically aren't worth anything until they are actualized... that takes a lot of hard work.