He needed the extra braking pOwA! to slow down the new subbie beast ....no, really it depends on what his honourable brilliantness was using it for, maybe the subbie was understeering too much on corner entry? I don't know, i wasn't driving it.
After hearing what he thinks about 4wd/awd I think the handbreak is to get the damn thing to turn. (a few hundred hp too few to use powerslides to cancel out the understeer on that track)