Originally Posted by
YOWgary
As Cow rightly points out, to create another tier of *A you'd need the whole alliance to commit to an additional tier of perk delivery, which isn't realistic.
OneWorld has a three-tier system so it could be viewed as a matter of competitiveness for Star Alliance (and Skyteam) to consider catching up on this point.
Even if it was just a matter of rearranging the deck chairs and carving out certain *G benefits for higher-tier FFs only.