Haven't played since the first closed beta - has grouping changed at all?

So I bought into the game when Founder's packs became a thing and played for a while in the first closed beta (or whichever one was the first that you could buy into) and I enjoyed the game, but the grouping mechanics frustrated me. I was playing with some of my friends and we were doing quests out in one of the adventure zones but even though we were in a party, no quest progress was shared and there was no kill sharing unless everyone attacked the enemies. Has any of this changed? Does the game work like most MMOs now and allow parties to share credit for kills and quests or is it still a solo game where you have to fight even your own party members for kills?