Breaking it down into 100MB rar files would just be to get around the file size limitation. On a proper ftp server it doesn't add any other benefit. On a web server it also has the benefit that if you crash halfway through downloading you don't have to find out whether resume downloading works with the current setup, because if it doesn't you'll have to start all over again.
And just so we're clear "torrent" is a protocol for communication, not a file server. Just like "ftp", "http" and "smb" you will still need to find somewhere willing to host the first copy of the file anyway, in the same way that you still need a first copy of a book regardless if you send it in batches of 10 pages in normal envelopes or in a big box, or individual pages folded into origami, and so on.