First of all lets get something straight.
Trion is not the Developer of Archeage, XL Games are. Trion "runs" if you will the translated english version of the game. All updates and most changes are from patches done by XL Games.
Trion have no ability to make changes to the game, to be honest I don't think they are competent enough to administer much or run advanced Database queries beside sporting GM and support personnel.
Regarding your comparison.
Your comparing a Blizzard title to a non-Blizzard title, shame on you..
WoW was originally designed to run on low spec computers, Archeage with a Cryengine 3 apparently was not.
Because Archeage use an engine that is a decade newer than WOW?
Because this game looks 10 times better and is not cartoon drawn style.
Unless your into virtualization there is nothing you can do to reduce or reuse the memory Archeage eats.
Get more RAM
