117 runs and no Vex Mythoclast. Some people i run with had 200+ runs. And No, not all are just checkpoint boss farms. Many were full runs. I can understand low drop rate for raid exotics. They are special. But if it takes more than a 100 runs, you are not encouraging people to raid more. You are pushing them away. I am afraid VOTD and King's Fall will be the same. I have been with Destiny for 7yrs now and this is the most disappointing and grindy phase i have seen.
You do not even need to increase drop rate. Implement a working bad luck protection on raid exotics or just give the player the exotic if they complete a 100 runs, out of pity. Or give triumphs to increase drop rate, like Duality dungeon. With how power creep has been developing, most exotic weapons become weak in a season or 2, needing a buff later. So, many people getting raid exotics will not break the game or make it too easy (check current usage rate of every raid exotic except for the one we should not talk about)
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The full run thing appears to just be an unconfirmed theory much like the catalyst one or just about any other theory though some people are asking for full runs to give increased rates which I can agree with.