First off I want to say that the goal for acquiring full gear sets is not very high. I am just shooting for a damage decrease or something for the gear now cause I felt there is no real need to have all the gear unless there was an incentive. The April update is allowing people to eventually reach max level by playing and grinding exotics for their next boost to a piece of armor or weapon. There needs to be an incentive to gather all gear sets or there is no real need to. A shader when you have all pieces is cool but what does that really do for me? Doesn't help kill or not be killed by the enemies. Whats the benefit to getting a whole new raid set when people will more than likely infuse it to something else to power their old gear up?
Example:
All Kingsfall Raid gear (5% damage decrease from Taken) or (5% damage increase to Taken)
All Vault of Glass gear (5% damage decrease from Vex) or (5% damage increase to Vex)
All Crota's End gear (5% damage decrease from Hive) or (5% damage increase to Hive)
All Vanguard/Crucible/Faction gear (5% extra rep gains) This will stack for faction exotics rep boost.
Other Ideas:
All Raid gear: Faster reloading and carry more ammo for all weapons
This would become a trade off from variety but make the goal of striving for gear sets that much more desirable.
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For the sake of saving variety, which we now have some semblance of it in the game; Set bonuses should only be implemented if we get vanity/cosmetic/transmog system. This way set bonus can be obtained, but still allow us to customize our guardians. An example off the top of my head, is if anyone has played SWTOR. In the beginning all the end game gear looked the same and thus, dull and boring. Gear in that game had components. What they did to fix it, was be able to attach the "set bonus" perk to the component, and then allow players to remove it from the "end game gear" and add it to the custom gear.