Respectfully, stop saying your bad rng is the fault of the game
Listen, I get it, not getting what you want is frustrating. Yet the common denominator of alot of the people having issues with this is the heavy focus on min/maxing.
This game is still in its infant stage. There will likely be gear better than what you are grinding for currently. There will likely be a character that drops who enhances or strengthens a character you might not be building currently. There will be bosses stronger than the ones you face now. So if you don’t get your very selective gear and substat after a bunch of key runs, it is not the fault of the game itself.
In fact, I would argue that you would spend your time better putting that same energy into just grinding for the materials to make the re-roll item rather than bashing your head against a wall looking for a specific loose brick, but thats just me.
Though, if you choosed to bash your head into that wall, you cannot blame the wall for every compact brick it has when you know there is a low chance of finding that one loose brick my friend.
Goofy ass analogy aside, the game is not scamming you, and the rng is not messed up. Everytime I hear what a person is looking for, I open my game and if I have it and 9/10 times I do (and if I don’t I probably will get it later on and think back to how hard it supposedly was to receive)
Luck is, luck. Gambling is, a gamble. Random Number Generator systems are, random. Try a diff approach, its all luck at the end of the day.