It would definitely be much easier and of preference to preset the Feeds section and our Feed Posts to automatically go to "Friends only", and only on the occasion that we want to go to the Global Feeds, then have that as the secondary option.
Particularly as obviously that is one of the main things about adding people as friends on here and not doing so with others, so that we can choose who we share with and see each others' posts, etc, whereas there's various people for example share too many spoilers which many of us would want to avoid, so it's best if those posts were more likely to be posted to friends only. Plus in general I'm more interested in viewing what people on my friends list are sharing.