This can simply be done by removing the elemental burns from the year 1 primaries and canceling reforge options. Implementing this would bring back year 1 players without breaking the game for anyone new to Destiny. On a side note, infusion for year 1 weapons and armor should only be possible once you have fully leveled up the weapon of armor to 170 light. Once you have fully leveled up the weapon or armor and used the etheric light, the option of using etheric light should change to infusion.
Please comment if you have anything to add or change about my suggestion.
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If they updated VoG and Crota's End it would be easy. It would be sweet to bring the VoG and Crota raid gear back.