Would be interesting to know what it is worth from an independent source; maybe someone has it tested?
Reason for the non-existence of the UM2 dual extrusion: Ultimaker tried and failed to make a system with which an UM2 could be easily upgraded to a dual extrusion machine (simplicity as with the UM2+ upgrade kit). And their tests did not show the results they wanted: oozing and hitting the print with the unused nozzle were the problems. Short enough?
You should ask them on their post
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