to me Diadem was boring from the beginning, just a huge zerg fest combined with rng when it came to drops
sure you can get some very nice pieces, but imo it isn't worth the time you have to grind grind grind. you could go 1000 times and not get what you are looking for. this is not like relic grind which will reward you at the end no matter how boring it is. it is purely luck based.
I'll probably not gonna join my FC anymore when they wanna run Diadem... unless they force us into it through the new anima weapons.
So much wasted potential