i dont see a problem with arcane egg achievement. they shouldnt change in back then in the first time. its logical to get achievement when u hatch the egg.

those who want to rely on their "luck skill" still can, the achievement is granted when u loot it. those who save up enough gold to buy it r now rewarded for their hard effort. still those who loot r in advantage here a bit, bc they can sell it (yes u need to spend plat but u would anyway, and along the egg u can get other uber rare items, and i think players dont open just for certain item but rely on many so they can trade if necessary) but those who buy for gold need to hatch so they have no profit.
so right now u have 2 possibilities and its up to u for which u r going to decide, gambling on crates (u know the risk) or buying for gold