With soft links, if you want to find out what other soft links point to the same file you need to explore the entire universe. (One could be on a USB flash drive in the back of a desk drawer in an office down the hall.)

For added enjoyment, consider a soft link that itself has multiple hard links. A soft link is, after all, an inode, and nothing says it can't be referenced by more than one directory entry. The real fun starts if it is a relative symlink. Now you've got a symlink that resolves to one of several places depending on the directory from which it was referenced.

Yes, another feature available with symlinks but not with hard links is the possibility to create relative links.