[Pharo-project] question about O2 vs OB

Hi, was wondering why we need O2 and OB as two different frameworks?, and why O2 is not an extension to OB, are they structurally different in design and implementation? I was wondering about this since i read the last emails about O2 and OB decoupling. Because now if we reintegrate O2, the system will have much more complexity. Thanks, Fernando