I'd like to see an additional use for Blood Shard, like maybe you can substitute a forgotten soul for 150 blood shards when using the Mystic or when crafting. I mean if you're farming rift's you're gonna get a soul at least 1 in 3 rifts at T1 anyways and with a cap of 500 blood shards it's not that exploitable I don't think.
Side tangent:
I'm starting to think Zeal is an awful rune for Slash unless you're stacking holy damage or something, because having bigger range gets more use in big fights and the 20% crit chance one has a lot more power behind it. That being said, by the time you hit 5% attack speed on the stacks you're probably almost wrath capped so it's not like it's really helping all that much, and 5% attack speed doesn't really help on any other attack besides Slash and maybe sweep attack? 5% attack speed on a 1.15 speed weapon is like almost nothing, you can barely even feel it unlike with frenzy on barbs.