That's a false assumption that the man page even has the info you need. There are channels to write bugs against code, but almost nothing to file bugs against man pages. That's not even a concept to most people, that it's a bug when you apply a use case (say, to apply eui-64 to SLAAC in IPv6 in order to generate a consistent address) and cannot find the information using the man page. If you filed a bug that the man pages failed you nobody would fix it because it's not sexy, glamorous work. Its easier to tell someone to RTFM.
In this case, you would have to already know about the existence of eui-64 to know that is what you want. I've seen this many times, you have to know what the thing is already, or know what the answer is to your problem, in order to find it in the man page.
Total waste of my time. I don't care if it's free or was created by volunteers, that isn't absolution of criticism when it represents something and fails to deliver it.