https://www.bungie.net/en/Explore/Detail/News/47017
The first paragraph finally gives us a proper explanation as to why we didn't have our D1 gear in the intro to D2
"It was a day that was supposed to be a celebration of our past glories. The anniversary of Six Fronts — the victory that united the City and gave us the Vanguard. Guardians donned ceremonial armor to commemorate the event, and gathered for a rousing speech by the Speaker. Then everything came apart when the Red Legion struck."
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Seriously I am dying to know what goes through their heads sometimes, this celebration should have started off the game and if not this then zavala's little trailer that preceded the may reveal of destiny 2 last could have as well.