This is what happens to all MMO during huge content patches that pushes past the original end game. Just look at WoW in the beginning, WoW is a gear oriented game. Every single time a new content patch comes out, all the gear have to be refarmed again. Have your vanilla molten core gear painstakingly farmed over weeks? A single quest reward green gear replaces it. Do people complained about it? Yes they do but they all all moved on and continue to play.
The game can’t move on and introduce new elements to the game unless it breaks the current meta and introduces a new one. This is something which everyone has to understand unless one expects the game to receive no updates at all.