Just one observation - Milestone never was a level.
The perks that weren't sustainable were unlimited Platinum laundry and guaranteed dining reservations.
Laundry isn't included in the perks for sale program and dining reservations are priority - not guaranteed.
Diamond members still have unlimited laundry and guaranteed dining reservations. So trump both Platinum and the new program.
As always, it is always subject to change, with or without notice, with or without cause.