As an Enterprise Architect, you want to produce architecture designs that are elegant and simple whilst meeting your customer’s requirements. It is very important that each design has proportion and balance.
Consider an artist creating a painting, the artist does not churn out a perfect canvas in one sitting, but starts with a broad sketch to define the outline of the painting before filling in the details.
The same process applies here. Get the “bare bones” on paper and then start fleshing it out. If the big picture does not make sense, fix it before you move on, otherwise it will mean more work to correct later on.