I reckon other memberships might not actually serve any additional purpose for now, since Copper unlocks the Full Member privileges, which are pretty much sufficient for an average member, unless we're talking about no-ads or accessing a premium lounge.
Small correction: It unlocks limits up to a Member
[ish] rank only.
- Even though you have a point, there could still be other memberships for replicating other ranks by providing different PM, action, and signature limits.
~Snipped~
(no longer remember if they can change names or not).
VIP members have that ability.