The Core theme is the old APS style. I liked it a little better than the newer SMF Core.
Agree. It's what I use. I'm guessing that the high use of SMF core is because when we updated, everyone was switched to that as the default?
Interestingly, when I tested the dark theme a couple of days ago, I saw that it's not only a different color scheme, but provides different information. For instance, when you go to Roundtable, it shows you who is currently online there. Until then, I had thought that themes were just different color/layout schemes, not that they also provide (or not) different information.