Greater Rifts only drop loot from the Rift Guardians, but that loot is quite good, and apparently even level 1 Rifts drop Torment-only loot.
Since the Rifts get progressively more difficult, and completing a Rift run results in choosing between increasing the difficulty of the next Rift, or trying to upgrade a Legendary Gem (and thereby ending your Rift run, necessitating finding another Keystone of Trials), what is the benefit of doing well in the Realm of Trials?
If I throw the Rift trial, and start at a level 1 Greater Rift, won't I wind up with more loot per Keystone of Trials I find?
Is there a benefit to advancing as far as possible in the Trial that I'm missing?