I left WoW for something new i played that game since launch-2011, it also had many errors and fixes upon launch and to this day, Swtor is a great game with a few bugs they will get worked out so don't fret.

With the new patch that allows u to upgrade/breakdown items without a assembly station u can just keep all the mods from your gear and use them on new gear easiest way to get the mods without spending lots of credits on galactic trade.

Yea i have played all the games, u can get it confused easy if u dont understand where these games all line up chronologically.