Zero tolerance?

In our enthusiasm for all that is new, unusual, and avant-garde, we might be less concerned with objective viewpoints and explanations, and more concerned with "self-expression" and the need to be creative and unique. But how realisable are our ideas if we gloss over the more realistic points, details, flaws in circumstances and of people? Yet for our ideas to be spontaneous and direct - "blue sky thinking" - how much constraint should we tolerate? Is ideation then about egos and instant gratification - wow! - or the first step towards bold yet sustainable change - Aha?