Quite a few of the properties a run of text might have are not controlled by styles, and Format Painter makes gives a uniform format for all the selected text:

Quite a few of the properties a run of text might have are not controlled by styles, and Format Painter makes gives a uniform format for all the selected text: if you go this route, you still might have lots of hand reformatting to do. The point I was making is that the more of Word's advanced features you use, the more of these kinds of mismatch you risk encountering.