I think "Jump" is just using your legs to throw yourself in the air, and bounce is just a smaller version of jump, if that makes any sense.
3 years have passed since I was alone Even the cityscape has changed But why are you leaving only the unskilled There is no really good guy Remove the matching ring I'm sorry It looks like an idiot even if you wait No no no no no I like you too much No matter how strong the liquor is Undistorted memories are like idiots There is no really good guy Remove the matching ring I'm sorry What's this tear like an idiot
There are several different reasons depending on the perspective you look at it.
If you're looking at it from the government perspective, then this was due to the fact that they wanted to get rid of the tradition and have a complete take over of the culture by getting rid of it.
Other explanations are that they wanted to switch an alphabet or genuinely wanted to simplify the actual characters.
Hope this helps!
