Hi Eng Swee, (and Aaron,)
The PMs and space editors for several of those related communities apparently agreed with you and submitted a more rational organization for the new 1DX ecology. PI and PO will be grouped together in the latest submitted proposal for the Community Topic Page. I believe that both items will have primary tags and both will be associated with the common CTP. Need confirmation on this, but it looks good at the moment.
Cheers, Mike
SAP Technology RIG