Interestingly Sly, this is part of the reason I wanted to make this post.
I think there is a misconception that Builders being able to build is all that is needed. While I agree that is an important…it isn’t the same for other types of players.
Hunters don’t hunt just to hunt…they also get loot!
Collectors don’t just break blocks for the fun of breaking blocks…they also get loot!
Explorers don’t just explore to explore…they will find crypts…filled…with loot!
But the builder option doesn’t have that same progression.
If you build, you build to build…and you provide your own satisfaction…or it is provided by peers via footfall or social recognition. It would be nice if in the late game, those that specialize in building can gain rewards that utilize their specialization as a means of acquiring those items.
Also, as a fun note. Titan Cores can make flying items 
It doesn’t mean that they can’t also incorporate one specific type of Core or Essence that would allow for this.
Well, I say that…knowing that this suggestion is very likely to not be implemented…and that is totally okay! Just happy to have the conversation about Builders and end game, and put ideas out there!