"Easier to read" is the biggest advantage IMHO; I don't find that they are "easier to write": for me it's more immediate to write code in a big dirty main, than

"Easier to read" is the biggest advantage IMHO; I don't find that they are "easier to write": for me it's more immediate to write code in a big dirty main, than in small and self-documenting functions. But there is no choice: you must refactor your code if you want to understand something later