Some folks think that braid can actually wear into the spool over time, causing the spool to get small grooves where the line has worn into it. I have never seen this first hand nor do I think it will happen with a decent reel. However, I always put backing with braid, but I do it because I don't like to fill the entire spool with line. I put a good bit of backing then braid. Those curados have a big spool and I don't think it is necessary to fill it all the way up. Plus it is expensive
