RNG isn't some conspiracy out to get you, it is exactly what it claims to be - a random number generator.
While this system doesn't reward hard work, it never claimed that it would.
To play devils advocate, there are methods for earning gear in game that do not rely on RNG - while you cannot reach 30 without running the raid at least once, you can get pretty darn close without having to run it ever.
Could they improve upon this system to reduce the amount of repeat loot you get? I don't doubt it.
Does the fact that this look system has aspects that many people dislike equate it to a mistake? I wouldn't go that far unless it never gets adjusted and other options for loot gaining are never introduced.
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Perfectly put my friend.