In the current EoF system, weapon tiers depend on player power and activity difficulty, with no way to upgrade weapons. This means that weapons from sources without difficulty modifiers are capped at tier 3, such as Crucible, Gambit, Iron Banner, Dares of Eternity, and Xur/Banshee weapons. This is NOT okay.
ALL weapons need to be fully enhanceable to tier 5. If Bungie doesn’t have them drop from those activities, they need to implement an upgrade system (probably using a currency like Spoils of Conquest).
Edit: To clarify sourcing, the TWID says the new gear only comes from Portal activities, which streamers have collaborated. “To get the best gear, you will need to face the hardest challenges, like Grandmaster and the new Ultimate difficulty, which you reach by adding different modifiers to the activities found in the Portal.” Note that this excludes raids, dungeons, or other difficult activities via the director. It has to be through the portal to drop tier 5 weapons (which I assume may rotate through those.)
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This was the problem with releasing info the way they did. Even though it was an extensive preview, it was just a preview. They showed us, what Bungie let them show us. Bungie is going to have 2 more reveals. While you may end up being correct about the limited access to Tier 5 gear, it is too soon to say for sure. The streamers had no access to crucible, raids or dungeons, let alone the ability to complete them on Master.