pineteam
This is not exactly a case of it ain't broke. All the Airbus varients mentioned react differently to rotational inputs at different CG locations, especially rearward CG. There was an instruction also to keep some rear seats vacant. Since there is no aerodynamic feel in the stick Airbus deviced this rotation mode so pilots don't need variable techniques or judgement. Now something has turned up so they will modify the software. Till then the OEB or FOT will remain operational. It's more of a proactive measure.