Ashley:
I find it really good to copy paste a sheet because if you can, you can try out some stuffs without getting confused what has to be disabled all the time and what not.
I already did.
It�s just easier for those who are not that strong in programming or those who just don�t want a mess in one sheet.
Because if they see the new sheet works, they can calmely delete the last one, or use it for something else.
And in my special case: If I teach children and teens. First of all they need to learn the interface. That�s surprisingly difficult for them. Even when I think that�s a simple interface.
I could give them a copy where they just simply copy the sheet, if they didn�t understand, or just don�t want to understand. Last think happens often. But the fun in making games should stay anyway.
Also I realize, it could be a nice thing to use includes. If you see that some events work, and you like it on an extra sheet, you could just copy+paste them to another sheet and use include.
Or if you can copy an entire sheet, you just copy the entire sheet, delete the events you don�t need and then use include.
This could be good for those who are not strong in Javascript. People can make events for other people without using Javascript.
As you can see the use of copy+pasting an event sheet is high.