Unfortunately, we did - not - choose which guild we ended up. See, i put darkness as my first choice and am now death commander.
If you are truly loyal to one element there is no way you will end up in other guild. For example I asked specifically to be placed in guild only.
And I followed the rules that told us to name 4.
^ That. Guild placement was random and no one really had complete control over it. You either got a lucky break or you didn't. Therefore, I don't think it would be appropriate to reward trial participants for having RNG on their side, for just HAPPENING to wind up on their favorite element's guild and just HAPPENING to also select that element as their trial of choice.
I also have to say that I'm not totally sold on loyalty bonuses. I suppose that yes, it is nice to reward those who have shown that they care about their respective element, but as first time participant, it kinda feels like higher ups kicking sand in my face.
Having said that, if this continues to be a thing, there should be other ways to earn loyalty points then just "hurr durr you participated in trials before". I realize that's paradoxical to what I just said about guilds, but I stand by it.