Sketches are not precious and can destroyed to make room for more ideas. Unpreciousness is the quality that an experience sketch needs to have in order for a designer to be able to throw it away.
Unpreciousness may seem counterproductive but actually it’s an essential aspect of design thinking in that it allows for rapid iteration with the lowest cost possible. The level of fidelity of the sketch should only be as much as is necessary to make a decision for all the stakeholders involved. Sometimes this means training the stakeholders to make decisions at a lower fidelity than they might have been accustomed to in the past.
The goal is to create a design process where you have the willingness to scrap what you’ve done and start over.
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Reminds me of a blog entry I read on perfectionism that’s chancing my views slowly and surely: http://www.defmacro.org/ramblings/taming-perfectionism.html