The Destiny "RNG" is undoubtedly a "PRNG" (PseudoRNG), which means it is generated by an algorithm, which prevents true randomness. (I wish everyone would say "PRNG", which is correct.) However, one can't "tweak" randomness. True randomness can indeed get you the same number, or item, multiple times, which is entropy. The alternative would be not to use a PRNG, but instead use a different algorithm. This would perhaps be too taxing, and expensive in coding. A PRNG is probably the easiest and least expensive way to provide gear that has many different rolls. However, adding a human touch to prevent one from getting guns with silly conflicting attributes would be nice. When they "tweak" their PRNG, it can no longer be called random. But it still would be an improvement. The less the game relies on a PRNG, and more on intelligent human programming, the better.