I've always been an advocate of uninhibited trading in MMO type games. I'd love to be able to trade some strange coins for ascendant shards, or a lot of glimmer for a vanguard mark. Sure, it means some players may receive high level gear with a fraction of the work, but that can be resolved with some itemization fixes, and it opens up a lot of content for players that don't have time to grind for hours to reach a high enough level for raids