Literally Bungie; "Hey everyone hates end game content because it takes ten hours and gives half the amount of loot as a 5 minute activity. How can we fix this... Oh I know, let's make everything else slightly harder to mildly annoy all veteran players, and punish new players, because some crappy YouTuber who doesn't work a real job said so... Oh btw we're going to talk about accessibility for 5 months, but then reset your power level so that everything you did before doesn't matter".
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If your endgame activities are taking you 10 hours to do before the change then that sounds like you just don't prepare for the stuff right or your having something else going on. Most raids can be done in an hour or less and dungeons can be done in 40 minutes or less. If your doing all of them through lfg then there's your first problem.