I read that explanation and I had to go and check a page because I didn't remember seeing a +1 or share button on pages. Now I've seen that, I don't really understand why those aren't on profile pages as well.
As a developer I'm looking at all this and reckon you're over-thinking it. IMHO there shouldn't be much difference between profiles and pages, and hence there shouldn't be much difference between the function available in the associated badges. The differences start to look more confusing than helpful.