I believe so too. Also we still have people that dislike us, so if we can temper those around us (without us noticing it) what would stop us from tempering everyone thus having no single person against us. (Other than echo users) In the end someone that is doing so much good for the people will become beloved, even if they might not be nice every single time.
But I do find the sudden ability to shield people from tempering a bit too much. This was nowhere mentioned in the story thus how does our character know how to do this? And if this is possible couldnt Urianger (the plot item creator) not create something that brings out a shield thus making it possible for others to fight primals? I mean in a world where they can suck out someones aether to give someone else the fake echo, something like that should be possible?
You know I sometimes want to ask Elidibus why he never told us the truth (early on when we still did not have that deep ties with the scions) if that would change our mind? Maybe the truth is that mastering the echo could make you into something like the Ascian thus immortal and for a lot of people this might be enough to stand at their side. (And if you are immortal you would probably survive the rejoining too so no reason to against it, right? At least in their view) Also if he can temper people why was Thordan not tempered, or why is the leader of Garlemald still not tempered?
I am fine if there are some things that we find out to be wrong, but I would find it really bad story telling to just change a lot of how the echo works. Because if that happens, how can we ever trust any information in the story which would leave a bad feeling (imo).