Self-explanatory title. For example, upon completion and "turning in" of the "Petra's Run" triumph, you should be rewarded One Thousand Voices, and for "Like A Diamond" you should be given Anarchy, and for "Crown of Ease" you should be given Tarrabah. For any future raids, the same rule applies for their exotics and flawless triumphs (if Bungie continues to do this) too. All should be guaranteed rewards upon turning in the flawless triumph as a reward for doing arguably one of the most challenging things in all of PvE, as well as to give players the option avoid the downright ridiculous RNG for getting one of these weapons through a test of skill, not luck. At least that way, the weapons will feel more "earned" rather than having just gotten lucky from a drop instead.
Agree 100%. I only did a few raids but I know people that have over 50 LW clears with no 1K. And by 50 cleara I mean 50 full runs not 3xRiven then heart.