It has made it possible for people who would not normally have been able to attach pdf files etc. to content articles to do so with ease. There is a way of doing this without the extension, but it is so convoluted that none of my site contributors ever managed it and it meant I had to do it for them.
One suggestion. The term "attachments" is normally associated with emails and is not normally used on websites. Perhaps substituting the title "Downloads" would be clearer? Perhaps it could be made an option?