I'm not seeing the difference. 3 items drop, 1/7 to get 1 in your class, 1/49 to get 2 in your class, 1/343 for all 3 of them to be in your class.
for current system, 1/8 to win 1 coffer, 1/64 to win 2 coffers, 1/512 to win 3 coffers.
Being able to need all 3 coffers is nil, because there has always been a chance to win all the loot by default of the server just handing them to you. The only difference is that now we get to pick what piece we get after we win the coffer. I don't know how anyone can argue that the old system is in any way better.