I get that but seems like it wouldn't be to difficult to ad one to the SC. The SC is a nice size, not too small but but still very portable. I'm sure a lot of people would be interested in a horn loaded version.The SC is aimed for people that don't dig horns. Like, but different than the 10 series cabs.
If you like horns, then the SM and BB2/BT2 are your best bets.