I think the current system is fine on paper, but it needs some serious tweaks. For instance, once you get to around 290+ Light, anything you take to the Cryptarch is going to be either completely useless, will take some serious Infusion to actually be useful, or in rare cases will end up being Infusion fodder for something else. More often than not, any Legendary or Sublime engrams I turn in ultimately become Legendary Marks. Also, a return of Etheric Light, to at least bring year 1 gear up to the point where it can be Infused would be great.