When i came over the Legacy of Dreams gem i thought it was amazing since you could have the freedom of using legendaries and still be viable but now im not quite sure. I came across a Barb Paragon 640 and was surprised he was doing GR 65 pretty fast while i cant even damage these guys even though im higher than him in Paragon. I had 2000 more strength than him but he was wearing the Wastes set which gives him some insane boosts like +10 000% damage with rend AND whirlwind which is crazy.
My legacy of Dreams only gives at rank 40 153% increase in damage per legandary item. But even maxed out at Rank 99 it will still be way subpar to that set. It gives 375% and you have 13 items so that ends up beeing only 4875%.