This is my opinion rather than scientific fact so please challenge me if you think it sounds daft, but the geometry of a cyclocross bike is different to that of a XC MTB. The former has a geometry similar to road bikes so the weight of the rider is distributed differently to that of the latter, especially with the ubiquity of suspension forks on XC MTBs these days. It also means that cross bikes have faster handling than MTBs because of the head tube angle and rigid fork,
Most cyclocross circuits tend to involve lots of dead turns and fast straight sections. These suit quicker handling bikes, hence my statement.
This is my opinion rather than scientific fact so please challenge me if you think it sounds daft, but the geometry of a cyclocross bike is different to that of a XC MTB. The former has a geometry similar to road bikes so the weight of the rider is distributed differently to that of the latter, especially with the ubiquity of suspension forks on XC MTBs these days. It also means that cross bikes have faster handling than MTBs because of the head tube angle and rigid fork,
Most cyclocross circuits tend to involve lots of dead turns and fast straight sections. These suit quicker handling bikes, hence my statement.
Does that make sense?