The comparison between oneworld tiers above is flawed.
I don't think oneworld member carriers will ever give up the idiosyncrasies of their programs. There is a reason for the differences based on the service structure and networks of the individual carrier (e.g. long haul / short haul: CX has almost no short haul, while swiss may end up being primarily a short haul carrier)
I also don¡¦t believe that just achieving top tier in any oneworld carrier is desirable: there will always be perks associated with YOUR airline.

The opposing view is SAME club structure for all oneworld members, i.e. same perks per tier for all, and ultimately: the oneworld club
What would you prefer? Local color or globalization? The Lexus or the Olive Tree?