So far I've learned 2 things about rift hunting:

1. The only new unique reward from it are the essences
2. To get to higher tier rifts, you need consumable 1-use "motivations" that let you open tier 2 rifts instead (which give higher tier essence)

Are there any other ways of getting motivations except crafting them? Are there any other rewards besides the essences, and do we know if they are actually used for anything besides crafting the new legendary armor once it's available in 9 months?

Either I'm missing something or they don't seem that interesting or lucrative to run a lot, especially if you're not interested in the armor? What's your experience with it so far?