Splitting the XOs could be done blindfolded by David Wilson and Co. He must have his reasons. I hope Debbie will chime in.
Personally I enjoy having the option of split XOs so I can bi-amp. I don't need more than a pair of M1.2Rs but being able to strap in M2.2sfor midbass duty sure is nice. Wattage differentials are not as much as an issue as input sensitivity differentials. Even if the 2.2s are twice the power the hand off is seamless. The high impedance IS of the 1.2 and low impedance IS of the 2.2 are almost identical. Even if there is a big discrepancy adding a resistor for the bass amp inputs is easy. Then there are attenuators like those made by Scott Endler.
Personally I enjoy having the option of split XOs so I can bi-amp. I don't need more than a pair of M1.2Rs but being able to strap in M2.2sfor midbass duty sure is nice. Wattage differentials are not as much as an issue as input sensitivity differentials. Even if the 2.2s are twice the power the hand off is seamless. The high impedance IS of the 1.2 and low impedance IS of the 2.2 are almost identical. Even if there is a big discrepancy adding a resistor for the bass amp inputs is easy. Then there are attenuators like those made by Scott Endler.