I've always wondered that, too! I had a pattern that specifically said to break the yarn, and it didn't make sense to me why I couldn't just cut it. My need for order and having things need couldn't stand the ragged edges of the broken yarn, and I had to snip the tip. I felt really guilty since that wasn't following the pattern, as it specifically said to break it, but I just couldn't stand it. I'm not feeling more comfortable and don't follow patterns as closely and don't care as much, but I still can't break yarn unless I can find a specific reason for doing so.