Some people like their personal full-programs inside a single-file, I think the appeal is that after opening you only have to keep scrolling to continue reading

Some people like their personal full-programs inside a single-file, I think the appeal is that after opening you only have to keep scrolling to continue reading the other "files", or that if you need to attach it to an email or something similar you are sure it has no dependency on other files, but yeah the trade-off is not worth it.