Why AORs are bad:
(I think kev 99 has been reading stuff I've written. Regardless of whether the criticisms are valid for all AORs, they are definitely valid for the Fort class.)
The replenishment side of the RFA needs to be scaled to support - as much as possible within budgetary constraints - 1) CVF, 2) amphibious task groups and 3 Cdo Bde, 3) small deployments and standing tasks.
Small deployments do not require solid stores as a priority: they tend to be run on "peacetime" conditions with no major ammunition resupply required; food supplies on escorts can last a respectable period; by far the greatest demand is for fuel. Hence why the Rovers, Waves and Leafs have very limited solid stores capacity and relatively lots of fuel. They *do* have a small and rarely practiced food replenishment capability, mostly by carrying reefer containers on deck.
CVF and ATG on the other hand require LOTS of dry stores AND lots of fuel. A QE class carrier engaged in serious combat operations will use munitions and AVCAT like they are going out of fashion and Marines are hungry fellows.
So the requirements for small deployments and for task groups are quite different. In a world of limited budgets, small ships like the Rovers are a luxury and it is better to have two or three classes of replenishment ship: specialised ammunition and food ships to support task groups; specialised tankers to support task groups and small deployments. Sending an AOR for something like APT(N) or APT(S) is overkill. Unless you build lots of small and inefficient AORs, but those are inefficient for task group deployments, so why would you do that?