With patch 2.6.5, Diablo 3 has received 3 new torment tiers (14, 15, 16). As I was running greater rifts and normal rifts which match difficulty wise (65 = 14; 70 = 15; 75 = 16), I realised, that experience wise, normal rift are faaaaar behind greater rifts.
This made me wonder, what exactly is the benefit of the new torment tier levels? Do they provide more drops for certain items?
Please note that this question is more about the rifting aspect of the game than the other content, though a list of changes in other content is welcome as well.
Best Answer
Even assuming that you want to exclusively run greater rifts, the new torment levels will help you continue to do so. Greater rifts require GR keys that drop from normal Nephalem rift bosses. At higher torment levels, these bosses will drop multiple keys. This table shows how many keys you can get at various difficulty levels, with fractional units being the percentage chance of receiving an additional key.
More keys per Nephalem rift means fewer low-experience rifts and more time doing greater rifts. The linked resource also points out the other benefits of the higher difficulty levels including a higher legendary drop rate, more gold, more death's breaths, and more Horadric cache materials.