Hi Lyon.Lim,
The problem with OPRP was that it evolved over several phases ending up completely different to its original intentions. And it still keeps evolving.
It ultimately depends on what is auditorially acceptable. Preferably IMO requiring the minimum amount of cogitation.
If you refer to the Tree (Procert) issued by one of the "designers" of the iso22000:2005 version, it is predicated on keeping things "simple" as far as possible.
TBH the more involved the Standard gets, I now think that the tabular format makes life easier.
After all, the iso basic concept (ISO22004) is that the designation between CCP and OPRP is not so important as long as the significant hazards are controlled.