[danso]

No disagreement there...I think it's just extremely difficult for Google+ to do auto-circling without either:

a) Creating a Facebook-like profile system, with more regimented fields and discrete data.

b) Totally disregarding users' privacy by doing it for them.

All of these are technically possible for Google, but they also have their major drawbacks. Where Google has been able to do it without downside - your private list of closest GMail and GChat contacts - it has.