People will always find a way to abuse the system . As with all things, common sense should be applied. In my opinion, that developer used none. I am actually in favor of only using the standard sized icons for the most part. However, if I have some sort of error handler that only takes an error input to publish or something, I will make a small rectangle icon with only error in and error out so my queue ref wires don't have to navigate it etc. The more you develop, the more you learn to organize your VIs on the block diagram in a way that you can avoid bent wires even when using the standard icon size. But for certain cases, it is certainly nice to be able to reduce the size.