Because it's a fast way to get that interactivity, rather than having to explicitly code it yourself. A good example are modern math videos on youtube, like th

Because it's a fast way to get that interactivity, rather than having to explicitly code it yourself. A good example are modern math videos on youtube, like this one (not saying that they're using G9.js in particular): https://www.youtube.com/watch?v=spUNpyF58BY https://www.youtube.com/watch?v=spUNpyF58BY It's 20 minutes of changing graphics. You could code all of that with P5, and it would be an excruciatingly long process. G9.js would get you there in a fraction of the time.