I think the point is being missed here: game design is full of intent. They have been making games for decades at this point. They know exactly what they are doing with the abysmal drop rates. They did not make it bad unintentionally. It was not a mistake. Now what was the intent, we can only guess (looks at the cash shop).
First of all, it likely is to get data on the organ. People will bash their head against it for an exorbitant amount of time and generate all the data they need to improve on it.
Second, they need to sell some stuff. Look at Dewelion. How many people actually got it by farming it naturally? The Wazzard set is Dewelion 2.0.
Retention, maybe? That’s a stretch. Burnout will kick in faster with such odds. If people log in every day, they have something else bringing them back.
I am certain that both of the rare drops I’ve mentioned will be moved to a more appropriate place when it is convenient for the devs. Just please, don’t say that it’s a “mistake” or it’s “secretly” doing something. Game design is very calculated. They are not trying to hide anything.