I am not a fan of Word specifically. I find Microsoft programs are over encumbered with features and make doing basic tasks more difficult than they need to be. However word processors are good at things InDesign is not, just as InDesign is good at things word processors are not.
Separating the formatting from the writing and editing is usually a good idea. You can pick styles, sizes, alignment, hypenation, margins, and fonts that are easier to read on screen and edit in a continous stream without dealing with page and column breaks. Outlining features make it easy to rearrange chapters, sections, and paragraphs. Editing only text is faster since no graphics need to be displayed and no complex formatting or text wraps are applied.
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