[urbanautomaton]

Others have pointed out that the SLA isn't an issue. As for the separate service thing, there was a recent transition that was supposed to rectify this, merging the Apps and regular accounts services. The page you link to is about the need to remedy clashes caused by this transition.

During this process, users who maintained secondary accounts were encouraged to merge them into their Apps account. I used to have two accounts, one for Apps services on my own domain, and another for things like Reader. I now only have one, my Apps account, because the accounts clashed and had to be merged.

So the doubly galling thing about this Google+ farrago is that a) it proves that the accounts transition did not in fact stop Apps accounts being second-class citizens, but also b) most of us no longer have our secondary accounts, because we merged them at Google's insistence.

Add to this several years of teeth-grinding annoyance at the incompatibilities between Google Apps and the rest of the Google world, and, well, that's why people are complaining. :-)