I have done every destiny 1 and 2 raid multiple times, except the new one which I plan to complete this coming week at some point. This problem is twofold First: raids in D2 are far more mechanic heavy (looking at you Last Wish and Crown of Sorrow) than most of the D1 raids, making explaining them to people very difficult especially if they are not used to raiding. Second: many groups just assume people watch youtube guides beforehand (which not everyone does) and tend to be very intolerant of people who are still learning (kick if they wipe 2 or 3 times)