Why there are no orbs of alteration and scouring? Suggestions

They could be more rare, drop only as shards, but is not having them beneficial to crafting process?

Absence of both makes player search for more white base items of the type they want to craft. Is this the intended way and a reason for lack of those orbs?

Things that could help crafting without those orbs:
- Using bench/ disenchant on 3 items of the same type gives you 1 item of that type.
- Orb that allows you to take a white item and make a copy of it.