Buying a new expansion auto grants AA up to 5 expansions back (I think it's 5). I would have zero issues with new expansions auto granting progression (and the rewards) up to 5 expansions back. Heck, I'd even be OK with granting it up to 3 expansions back. As someone who has done a lot (not all) of that old stuff, it wouldn't bother me one smidgeon for people to be autogranted stuff I had to box my way through. Just because I had to travel uphill, both ways, in the snow, barefoot doesn't mean that people who come after me have to do it as well. That way, new/returning players wouldn't feel just absolutely overwhelmed with the amount of stuff they feel (or are told) they "need" to do.