Euripides said: "Second thoughts are ever wiser." I think his wisdom applies to second drafts too.
There is much magic in the opportunity to rework a document or message. Often the language becomes more crisp and the awkward phrase is eliminated. Errors are caught that were missed in the flurry of cranking out the initial draft, and in general, round two (or three or ten) is much better than the first.
When you are setting deadlines for yourself or your team, plan time for additional rounds of edits. Even if the first version is good, I suspect it will be better if you spend time reworking the piece. We don't have this luxury for everything, but for the important messages it is time well spent.
Think of writing like the shampoo bottle instructions and plan to repeat.
-- beth triplett