Alright, I'm going to be a weird and copy my own post and then put some more thoughts out there for folks to respond to.
4) Dogs in the Vineyard - Your backstory initiation scene (the situation is player-authored and the GM plays the antagonism/obstacle) involved you getting picked on (again) and your goal for the scene is "I won't let my temper get the best of me so that I end up beating yet another initiate into an inch of their life." You fail and therefore gain the 1d6 Trait "I can't lick this awful temper." When you deploy it in conflicts its apt to help you when you can use it, but its certainly a much better chance to earn you Fallout than a d8 or d10.
In the course of play, you lose some conflicts and therefore take Fallout. You throttle back that d6 Trait to a d4 which makes it a significantly complicating feature of your life. When you deploy it, it will help you because you've got an increased dice pool, but you're more apt to get Fallout (negative affects to your character that affect them thematically and their attendant PC build structure). Now your Temper is really causing you problems.
In a conflict in a Town, you're able to use that Trait in a social conflict, not escalate to violence, and win the social conflict (you get what you want without having to go to fists/knives/guns). Between Towns is Reflection. That Trait goes back to d6 because it helped you.
Rince, repeat in another Town. Now its a d8 (a major asset).
Win Con? No? Ok...
Rince, repeat another Town. Now its a d10.
You've mastered your temper and its an asset to your life as a Dog.
Win Con now?
Alright.
So see what I've written above? Your seminal background conflict (where you authored the situation) was about your temper getting the best of you (and therefore making your effort as both a human and "One of God's Chosen Watchdogs" much more difficult).
It got worse before it got better.
Then it got much better. You're finally in a position to not just control your temper, but to harness it to help you. Its kind of like Luke and the Dark Side in Star Wars.
However, there is no guarantee that this relationship persists. Like an addict, you may fall right back off the wagon. Next Fallout or Reflection might throttle back that d10 for your Temper Trait. Maybe it goes back to d4?
What if play ends that way (with a d4 Temper Gets the Best of Me Trait)? Did you lose that win from earlier? Though your triumph wasn't permanent, was it meaningless?
I don't think so. At all. It mattered. It mattered to play. It mattered to how I perceived this character. Honestly, the triumph amidst the ultimate loss may have made that fleeting win more substantial...more compelling.
And then there is the other reality that getting Temper Got the Best of Me to d10 may have been huge for other conflicts and trajectories of play. Maybe you ultimately didn't lick that temper (at the end of play it was a d4). HOWEVER, your momentary wins allowed you to master your temper (in game that means deploying that collection of d10s during conflicts) sufficient to win other conflicts and profoundly affect your life as a Dog and the lives of "the flock" and/or your war on Sin and/or your effort to uphold The Faith and/or to redeem your friend/parent/chaplain/ancestor. Or maybe just to successfully make the dangerous journey into the mountain redoubt of The Mountain Folk to hand over your well-worn and nearly ruined Coat to the Mountain Folk woman who made it for you before you ultimately retire (a show of love and synthesis between you and her and The Faith and The Mountain Folk finding a common path forward).
There are lots of ways that temporary d10 Temper Trait could dramatically impact play, despite the fact that you may have ultimately lost to it (maybe you were a d6 but got Fallout sufficient in that last effort to return the Coat she made for you that its now a d4 and you have to retire because "you just aren't good with people no more.").
I don't accept (and I really don't like) the all-or-nothing framing of "if your Temper Trait isn't d10 at the end of play, then you lost."
And its not about some nebulous concept of "fun." It concretely mattered to play that you got that d10 Temper Trait...even if it was just fleeting.