I didn't really notice the fact that I was scratching the lugs on my first few watches. But when I picked up my sub and a gmt2 I was much more careful and felt like I couldn't use the regular spring bar tool to get the bracelet off which was why I spent a decent amount on the fancy spring bar tool.
Do I need it now? Probably not....but it definitely makes things quick/easy and gives peace of mind for a novice spring bar remover...