Listen to what you're suggesting: merit based randomness. A contradiction in terms. I understand that its frustrating because other people are rewarded more than you in spite of you're "earning" it.
There isnt an algorithm that can analyze millions of players across thousands of games to deduce what loot table to place each individual. You want a concrete "I have played for X hours and this is my reward for that", or, "After I come in first in ten crucible matches I have a chance at a Gjallahorn". That is not RNG.
This was a suggestion strictly for the raid, in hopes that Bungie could employ a system of reward other than the one they are using today. Whereas today's system rewards items on grounds of RNG, and gives people who cheese the same loot as people who play through legitimately, another system could have certain progression standards to reward loot. Bungie has already implemented a version of a progression based system into Crota's End. Now, the fireteam must have at least one person cross the bridge in order to complete the segment of the raid. Perhaps this new loot system could employ slightly different loot tables based on the amount of progression (How many people cross the bridge, how long it takes for the activity to be finished) a fireteam has.
I see your point, although the definition of cheese needs clarification. Start of crota, normal mode; having a guy stay back for thrall free team resurrection duty is not strictly cheese, and the whole fireteam gets to fight the ogre. At what point does cheese and legitimate strategy seperate? More importantly, the same programmers who tried to fix the cheese and created a host of glitches in the process is now in charge of classifying what loot goes to what player.
I believe there are strategies and cheeses, and there is a line between them. In the Abyss, fireteam members can hang back and attract the thralls from people running to the bridge. I do not consider this a cheese, I consider it a strategy. The enemies are still present, but they are simply being attracted to a different group of people. On the Bridge cheese, however, a game mechanic is abused in order to cause all of the thralls to disappear, therefore taking the challenge away from the activity in whole. I'll admit, I've had my fair share of cheesing. The point to this post was aimed at the fact that Bungie keeps on pushing game hotfixes, only to be shown up by more cheeses. Instead of pushing these worthless hotfixes, they should be working on something to draw players away from cheesing. I've noticed in my gameplay that the people who cheese get the same loot as people who play through the game legitimately, and I've asked myself, "Why the hell should I get my loot by playing legitimately, when I could get it in half the time by cheesing?". My proposal is that Bungie gives us a new raid loot system that renders my question obsolete.