When the normal paragraph style has different settings than the defaults, there is a paragraph style version of normal and the defaults version of normal. When a user applies normal to text, the paragraph settings get applied. When Word applies normal,
such as during a paste or insert, and there is a third version of normal involved, Word will paste or insert the defaults version of normal. In effect, Use destination styles is working, just not the way you want it to.
You had fewer problems in earlier versions because the hard-coded defaults were TNR 12 single spaced, no paragraph spacing--and so no conflict. But that was by no means the experience of users who wanted to use Arial, Univers, or Garamond, use 1.5 spacing,
or 14 pts space after. I got unwanted TNR almost every time I wasn't using TNR. Because of the mismatch between normal and the defaults, many Word document developers avoid any using normal, others also avoid using any built-in styles. That MS remained
mum about the problem didn't help either.
The modifiable document defaults does add more steps to the process, particularly for those who are using older documents and templates. But they give us the power to eliminate wrong font pasting issues and several more.
I'm a freelancer who works to deadlines on client-formatted documents that I did not create (yes, some from the government too). Invariably, the wrong font shows up after a paste or in the tables. (The usual practice to avoid the bad paste is to use paste
unformatted text (Keep text only in Word's new-speak), and I use it most of the time. But I often need to keep character formatting and have to use a regular paste.) And invariably, when I check the defaults in these client documents, I see that they are
different from the normal paragraph style settings and that it is the defaults that showed up instead of the normal paragraph font. In about a minute I make normal and the defaults match. That eliminates the pasting and table problems; I get to concentrate
issues my client wants me to; and along with improved content, I return a document that is structurally in better shape than when I got it.
I understand that you really don't want to have to learn this stuff. But following the steps I described in normal.dotm and other templates you create will mean many fewer surprises at crunch time.