Imagine you had played TOR for 2 years+, then with no warning, no notice, nothing but rumors from players that got banned on the spot.....Bioware took the game down for a few days and removed your class and forced you pick another one, made all your items obsolete, and fundamentally changed the game play of TOR. That was the NGE for SWG.
This is it exactly. All your uber loot, gone, all your gear worthless, all your resources worthless. Crafting was broken for 6+ months so their fix was to hand out gear at each level that was better than what anyone could craft. Any bonuses you thought you got were gone, your one perk if you grinded and unlocked the ability to play jedi? You get to glow like Obwan with a buff. But essentially it was telling everyone, start over.