We need some method to cleanse unique items of the LP slam to be able to reattempt the slam. Even if a rare unique drops, it doesn’t feel good because you know you still have to slam it, and slamming is punishing more often than rewarding.
Make the chase for the exalted items we craft on successfully, not a chase for the same uniques with LP over an over because we just keep bricking them anyway.
Uniques have too many variables (i.e., their stat rolls + the roll of the LP (if any)) and then we have a limited chance to slam what we want. It’s not friendly or motivating long term.
If we could reroll bad slams, there would still be a healthy chase and economy for exalted items. In fact, we could then slam T6 affixes until we find that T7 affix we want to slam over that. This adds incremental progress that feels good, whether than that lucky slam that is too rare to maintain player motivation.