Synthesis was the perfect opportunity to reissue old shaders and armor. Make Synthesis a system for unlocking ornaments and shaders that players do not have in collections. Either keep endgame stuff locked away or issue a suitable challenge for them (Trials of the Nine shaders can be earned through Weaves but also need you to solo or flawless or both Prophecy for example). New players have a reason to grind to get rewards they want and old players aren't more screwed the more complete their collections are. Bungie really did this ass-backwards and I hope a swift course correction is imminent.