The regions are separate ecosystems, and availability of items within one region vs. another aren't usually particularly noteworthy because you're never going to see that player in Taiwan on your server with that rare item you got for logging in during some event, or got through that limited time promotion. We think it kind of sucks that a pet collector in Europe could never hope to get that China-exclusive Golden Pig pet
from back in 2007, or that just because you live in a region with a different business model where the Annual Pass didn't make any sense, that you never had a chance to get a Tyrael's Charger. We definitely do not want to undermine the exclusivity of someone's mount or pet between them and their friends, or guild, or server, or region, but we think it makes a lot of sense to have equality of items ... not even their availability
necessarily, but just their existing
, throughout all regions.