If the game has been out for this long and you are still loot caving, you have bigger issues. You can run 2 raids and a nightfall per guardian. Within each hard raid you have 2 good chances at exotic drops. So that's 5 decent shots at an exotic. Vog on hard can be easily beaten in 45 minutes to an hour. Crota on normal takes less than 30 mins with a good team. Not to mention the best legendary weapons in the game are unlocked in the raids. The only time you should be loot caving is if you have 3 guardians, all of which have done their nightfalls and both raids on hard mode. So 15 good chances at exotics and God knows how many legendary weapons. I think that less than 1% of the community has that amount of free time. Because 99% of your time spent at loot caves, with destinies truly awful random drop loot system would really be wasted.