At least in 1.0, the Echo referred to the status of those who could see glimpses of the past/present/future. At the time, it also bequeathed omnispeech to those with it; They could understand any language spoken, regardless of them hearing it before or not.
The Blessing seems to just refer to Hydaelyn's stop-tempering-block-Ultima gift.
I'm not positive the tempering is even related to that. Minor spoilers, but we're able to speak with a certain shady person even after story-related incidents happen, but someone else isn't.
I can't remember if they elaborate on why you're temper-free in 1.0., and even then it's possible it got retconned since there.
The Blessing seems to just refer to Hydaelyn's stop-tempering-block-Ultima gift.
I'm not positive the tempering is even related to that. Minor spoilers, but we're able to speak with a certain shady person even after story-related incidents happen, but someone else isn't.
I can't remember if they elaborate on why you're temper-free in 1.0., and even then it's possible it got retconned since there.