I really like playing the arena.
Even if it is a waste of time resource-getting wise, but that is for another topic…
However since you only get blue or brown stones I now have an abundance of both compared to any other color.
So my suggestion is: Make the trait stone drops in arena come in all colors
Yup, it was talked about half a dozen times.
They did answer they also thought it should be changed but never gave any due date for said change. But, yeah, I would also expect this issue to be adressed with the incoming 1.0.9 update.