[geezer]

I would disagree with Steven King here. Once you write down ideas, it allows you to reconsider them later in a different light, a difference context. I believe that is extremely valuable because it is crucial to analyze an idea from various perspectives before embarking on implementing it. Embarking on an idea not well thought out can be extremely expensive.

[chiaro]

Yep, definitely. The process of writing anything out (ideas, emotions, plans) lets you separate out the roles of describing the idea vs criticising it. Trying to evaluate them in your head requires you to do both simultaneously.