Telling people that the spinning wheel is missing is only helpful if they haven't read the thread as that has been said dozens of times.
No one is telling them that...why would they?
People are coming here because they notice that it is missing when do an upgrade, that is the only reason people arrive at this thread. Why would anyone tell them what they already know.
When they get here, they discover:
1) this was intentional and there is no way to reenable it.
2) how to leave feedback via apple's official support channels.
3) the utility of this feature and syncronous as opposed to asyncronous account checking and why these features are absolutly crucial to certain users and so dearly missed.
4) the two current alternatives, and the ways in which they work and the ways in which they are incomplete.
5) that some commenters no matter how many points they have will be incredibly rude to anyone with a different opinion then them or anyone who questions the changes apple has made
The first 4 are helpful, the last is truly unfortunate.
Why are you even wasting your and everyone elses time in this thread?