With the amount of RNG in the game, with how a wrong perk makes you destroy an almost perfect weapon, being able to try your chance at raid loot only 3 times per week is ridicolous, maybe the first completition should reward powerful/pinnacle gear but the next ones normal gear, raid chests could still stay weekly, of course.
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I think Destiny should treat raids like FFXIV does. After 4-5 months after a raid releases the Savage mode (that's where you are going to farm for gear in that game) looses its weekly lockout so you can farm the raid as much as you want after that 4/5 month wait because it allows players to finish the content and be ready for the next raid content.