Falling in the void is also a part of Lucky Islands, The truth is the void is an important part in a lot of minnigames because it provides a barrier to overcome between players, The reason it works in Survival games is because chest are very easily lootable and can provide you with all the basics in one go, Lucky blocks not so much.
This would lead to some people simply getting lucky by getting a weapon in the first block they open, then slaughtering everyone around them who didn't get a weapon right at the start. Sorry, but I'm gonna have to give you a disagree on this one.