If the BB2 (and the BB1 and Big One) before it was that flat and uncoloured as possible sound and as big a frequency range as possible.
then putting the speaker in a smaller box and not having a horn is going to change the response and not be as big range... as you can hear! The smaller box chops of the top and bottom of the sound in a way I really don't like.
I've currently got one of Stevie's BCCab which has the same objectives of going for FRFR, I've owned ACME B2 before that which did the same (and were what Alex used before he started building his own) so I love my raw sound. The SC does not give me that.
Now for balance, so it doesn't come across like I'm Barefaced bashing: in the mix for a lot of people the SC might work better, esp for rock/pop/indie stuff, there's a mid punch to cut through, no lows to mess with the kick drum and no tweeter will be better for OD and distorted sounds.