Ah I think I finally am starting to understand. It is a thing about some people not wanting to use their real name on Google products.
Isn't that a bit of a problem whether you are using a alias or not, since a co worker or anyone will eventually come across your alias while doing whatever it is on Docs or Hangouts or similar. Then look you up using that? I use Google apps constantly it seems that would happen quickly.
Is it possible to use Android without a Google+ account?
Use one name at work and another at home? The whole point would be to keep those spheres separate.
There is also the issue of (for example) the person with the surname "Yellow Horse" having her account closed down by the policy, as Google didn't believe it was a real name.
It also publicises your name, which may be a big risk for some people.