Possibly one of the smallest changes(and hopefully is a bug) is that guild banks are no longer accessible from guild registrars, which makes them only available in 1 spot in WvW – upgraded keeps in WvW. For many WvW leaders/officers it was the way to get siege out for the raid that day/night or easy access if someone needed to send a friend or guildie a large collection of things without having to wait for the mail internal cooldown(spam preventer).
Also with seasons fast approaching, leaving WvW(if no accessible keep in your zone) to go access the guild bank in a main city will then most likely make you wait through the queue to continue playing WvW after getting the needed item(s) since many players enjoy seasons, even if they aren’t a WvW focused guild.
I know vault access is an upgrade that is relatively cheap to use, but some of us roamers/small guilds/players don’t have the merits to just constantly be poppin dolyaks all around the map if we need something. Sure it looks super kitten to have your RP’ing dolyak appear out of nowhere but it still takes time, and by then you might be getting ganked by the nice enemy 80-man zerg