Honestly no. If you played year one only thing that has changed or added to change any form of gameplay loop is more fomo in form of seasonal content (you can no longer go back and grind past craftable weapons easily), only game mode added was gambit (I think), new dungeons and raids are great as always besides most recent raid wast mostly bad imo, and now with events such as solstice (summer event going on next week) I s just a boring grind fest for no look and having to pay really money for all cool cosmetics. So if you want to get back into it and play the new raids and dungeons I say go for it. But if you play for story or rpg elements or pvp skip. There lack on innovation in new gameplay mechanics or game modes is frustrating to me. I recently bought division 2 because I played the first and did not play the second and there onboarding is so much better and have a wide variety of new gameplay modes way past destiny and there gpg//build crafting is much better.

Edit: Oh and you don't have to weild double primary in destiny I think that changed after y1