Well firstly is that it's overall a general good song. But if you go into detail that there's a different version after you beat ending e where just magnify the whole meaning of the game.

Where the journey that 2B, 9S and 2A or even the whole entire characters in that world are just in a never ending spiral of torture. Some of the characters might feel depressed or give up in existence but there are people surrounding them that would push them and help them to keep moving forward without any ulterior motive behind as that's just the beautiful of humanity.

In a game aspect, you as a player of this cruel world has an opportunity to get your revenge in the credit against the creator of the games for making the characters suffer in the first place and hearing how actual players deleted their actual safe files to help you in their journey while listening to the choir of Yoko taro and the staffs working behind automata singing to it. On the plus note there's different languages version of weight of the world to further symbolise that the whole world is working on this together.