I was trying to give an example of how to avoid name conflicts without extra work. Notice that using the camera file name does not require a rename during import yet solves the problem of duplicate file names.
There are some good arguments for renaming images as you bring them into the computer from the camera, or afterward. I do not do so because of the extra step involved and the inconvenience of having to deal with long file names. But I don't sell my pictures (at least, not the digital form of the images) and so I don't have to worry about someone else knowing where the image came from. However, if you really want to be sure your name is properly affixed to the image you should use the EXIF and/or IPTC data rather than relying upon just the file name. File names are too easily changed by customers or clients.