Eric, thanks for the link but I did read that post, and found others like it. The problem for me is that I don't use Safari, nor do I use the cloud.
In answer to the original poster, I would not delete it because I don't know how deeply integrated it is into the system, or why. However, I have blocked it from communicating in or out via Little Snitch and the network works fine.
I am honestly worried about Apple's direction with the OS. Since the latest update to Yosemite I keep getting interruptions to send photos to the cloud, which again I will never do. I understand from the discussions on StackOverflow that you can't remove the Game Center from El Capitan, so I'm staying at Yosemite; I've got enough problems there.
And just to be clear, I love using the Mac and use Logic X Pro for recording, which I think is the best out there. But it's hard to talk down a furious client who has just lost a great take and is demanding that I "switch to a PC" (as if it were even possible). It's frustrating. I just want to use the Mac for the Pro apps; no games, no family stuff -- I use an iMac for that.
My $.02,
Chet