Yeah! I don't know how the new interface handles it, or how phone apps handle it, but on old.reddit I still see my list of multireddits on the left side of my main feed when I'm logged in.
I was kind of envisioning multimagazines and hubs as being two different things, where hubs would be created and joined by magazine mods, and then users would subscribe to hubs by default, where multimagazines would be user created and specific to that user, but one system could maybe do both...