With the "commendation" system and vastly larger weapon & equipment inventories; why would you even bother to advance your Faction reputation?
Only for the armor bonuses to Strength, Discipline and Intellect?
Commendations ensure you must progress in Vanguard and Crucible to buy Legendary items if RNG isn't kind to us.
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I'm back to factions because I have all of the things I want from the Vanguard vendors and prefer the faction weaponry so I'd rather get their packages. Yes this will lead to lots of crucible commendations that I won't raise crucible marks fast enough to spend, but it is what it is. All of my vanguard marks will go towards keeping my planetary materials full.