Dorico doesn’t do it by default because we have, in general, erred on the side of giving you the maximum amount of freedom to format material between the full score and the instrumental parts differently as we can. As far as we can manage it, we don’t want there to be a situation where you have to end up exporting a particular layout as a separate project in order to get the appearance you want because we didn’t allow something to be overridden on a layout-by-layout basis.
However, the flip side to this is that we also need to make it possible for you to say up-front that you want a particular edit to apply just to the current layout, or to apply to all layouts, and that’s mostly a challenge from a user interface perspective. It’s something that we’re certainly going to be working on in the future. In the meantime, Propagate Properties allows you to copy the appearance of (more or less) any item to all of the layouts in which it appears.