The ideal flow isn’t people making “lemmy” accounts like reddit accounts. Take an Arsenal fan. When he finds out the lemmy instance called arsenal.club, he doesn’t have to immediately know what lemmy is or what federation is. He can sign up, view and participate in his local feed, which will be full of Arsenal related stuff. And then he can stick with it or find the full capabilities of federation
If they default to “All”, random news is gonna fill all the default feeds which is weird for a general user