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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Personally I prefer perks on the gear as they are as opposed to set bonuses. For me it gives a greater sense of variety. Between exotics, and certain legendary pieces like a hood of malok or the Maulers, you would be deterred from wearing them in order to have the set bonuses. Just how I feel.