Well its understandable. Rappel is a cancer ability but if it got removed due to playerbase bias, I'd be foaming at the mouth because its what I got used to utilizing.
If you take a Zoe main's perspective, they've played around those kind of mechanics for a long time and its a lot of what they know, removing it to them is equilivant to removing a type of meat at subway so you can't buy the same sandwich combination again. They may also have a better understanding of the power budget it takes up or the importance of having it.
From other player's perspectives, is easier for us to see and hate something and wish we'd let go of it, like nobody who didn't get the imitation crab meat at subway will miss it, but those that did will, except in league is not so much we'll miss it but rather hate its existance and pray for it to go. That's when riot has to make a call; redesign something in a way that pleases everybody, or just take the bullet from that playerbase and listen to the majority.
######I want crab meat back at subway