Although it's currently not relevant to most players, the Afterglow effect should be improved to scale with ilvl content. Afterglow was introduced before ilvl and in its wake became no more useful than it was before its introduction.
With this said, I understand afterglow was meant to be a trophy of accomplishment and "exceedingly difficult" such that very few can obtain it, but if that is the case, the afterglow animation should be more visible and the relic/mythic/empyrean equipment icon icon should at least look unique in comparison to the 99-I version (similar to Sagasinger or Girru) if it's mainly for show. Otherwise the bonuses they bestow should be stronger than what you could get subbing bard and singing Valor Minuet I/Sword Madrigal or allow it to apply to allies, which would encompass alliance members and pets.
Furthermore there is a lack of balance between the effects of empyrean's afterglow versus the mythic and relic: Attack+15/Accuracy+15 is hardly comparable to Crit. Hit Rate +5% as far as DPS balance is concerned.
In truth, I would have finished my afterglow regardless as I am dedicated to Puppetmaster, but at least make an "exceedling difficult" task worthwhile for those that would accomplish it , and the friends that would help.