To be fair, ever since Uber has been recognized as a competitive tier and AG has been created, I don't even understand (apart from the fact that this is historically what has been done and people want to stay true to a pre-established order and are naturally against big changes) why Uber is still to this day considered as a banlist and not a tier. What I mean is that it "should" and could be the actual OU (given the fact that at this time MRay would have been the banlist of this tiers just like M2 was the banlist in 1G) and then UU would be based on the 4,52% cutoff of this new OU tier.
Obviously it is not advocating for everything to come back in OU (which would almost be the UU of this new way of tiering, minus some really good mons like great tusk and gholdengo if I am not mistaking) as the banlist (UUBL) of this tier could literally be the same as current Uber if it deserves to be like this.
You may be wondering what would be the point, to me it would essentially be homogeneity, every tier treated the same way because currently Uber is an exception. It would really be the natural way of doing things, because currently we just apply the historical way of doing things without thinking twice about it. Also, it would almost prevent the eternal question "do we unban things / do we immediately ban this thing" that is entirely subjective when DLC drops (even though unbans from UUBL could technically still happen) as it would entirely be based on usage stats and quickban could still happen just like they happen in lower tiers.
Yes, I am aware that this new way of thinking OU/UU would lead to completely different metas and that we may not have access to most spinner or defoggers for instance. Just a reminder that this is what lower tiers have to play with and noone is complaining about it (actually they are when they implore OU player to drops some spinner/defoggers) but that would simply mean a different kind of tier that would have to go through a whole retiring once again and reshape the face of OU (rather UU if you followed me), which is neither good or bad, it is just doable.
Seeing as how current UU is now the old OU it is clear that tier are only prone to evolution forever and most likely power creep and current OU could almost be an old Uber, hence why I think treating Uber as the OU would not be that big of a deal.