The aggregate view is really nice, especially on my sub page! This feature should hopefully be even better with the upcoming federation improvements assuming they'll tackle microblog federation, as that's quite iffy right now.
Since aggregate view essentially just combining threads and microblogs, it'd be best to have it as an option on the header alongside Threads, Microblog, and People. Maybe call it "All Content" or something like that to make sure it's clear what it is. Going with this, it'd also be nice to be able to toggle the default view (Threads, Microblog, All Content, or maybe People) in the settings.
ETA: Also noticed that the color of the new comment marker has been changed to be a lot less obtrusive (at least on darker themes). Very nice! Might be a good idea to have the color change with the theme.