RNG as a gear acquisition strategy has always sucked. You should get a defined amount of “gear currency” from killing a boss, and when you have enough currency you just buy the piece you need. Then start saving for your next priority purchase.
The Game Director’s notion that RNG provides a moment of elation for those that win pales in comparison to everyone else in the raid (or dungeon) that had a moment of disappointment. They should move to currencies for all gear that is currently “random drop” out of both M+ and Raid. World boss gear loot should likely also be a currency to eventually buy what you’re after.
They can pace the currency acquisition rate to match their desired time-played metrics so nobody gears up “too quickly.” I’ve no clue why they don’t just go ahead with that (they had it before with Valor currency in Cata to buy gear and they dropped it the next expansion for “reasons”?).