The psychological way to avoid this is "a GA item is simply the potential for something in the future, you haven't lucked into anything yet". And then "A GA item with successful tempers is a great new item, congratulations".
"Hi human, to be happy, pretend to not be human!"
The way I see it, tempering GA items is the real endgame for players who put many hundreds of hours into the game. If Blizzard made it easy to reset tempers, what would the endgame itemisation be? Players would "complete" their gear well before season end...
Even if it works for those people, they're a pretty small fraction of the playerbase, and for the rest of us
the current tempering system feels like shit. Too many temper results aren't suboptimal, they're effectively
empty slots. The more important a temper is to a build, the more likely it is to be part of a manual where the other possibilities are empty slots.
There should be something for the hundreds of hours players to chase, but it shouldn't be at the expense of the dozens of hours players. The fix for tempering isn't resetting, it's removing build-specific stuff from the tempering RNG. You can do this by removing build-specific stuff from tempering (I proposed this on the last page, by moving those affixes to gems), or by removing the RNG from tempering when you're dealing with those affixes (change some manuals, mostly weapon manuals, to a single result with a power range, like changing rogue's Core Augments from five options to only "+X% chance for Core abilities to cast twice").
It wouldn't feel so bad if you could reasonably expect to get more in the future, but right now good 2/3 GA items are difficult to get.
Right now, 2/3 GA items at all are difficult to get if you aren't playing dozens of hours per week. Good 2/3 GA items are not far off from Uber Uniques.
There's a reason Blizzard made all Uber Uniques drop with a fixed set of stats instead of RNG stats. They appear to have forgotten why when they decided on the RNG balance for the GA system.