It does not matter if you have turned off all phone home functions - WIndows 10 can't help it.
The usual crap about nothing important being collected is served - and leaves us wondering why anybody would construct the system to gather only crap...
The usual excuse is that the functionality gets better for you and that this will be an advantage.
They all seem to forget the human right of privacy in this equation....
Other traffic looks a little more troublesome. Windows 10 will periodically send data to a Microsoft server named ssw.live.com. This server seems to be used for OneDrive and some other Microsoft services. Windows 10 seems to transmit information to the server even when OneDrive is disabled and logins are using a local account that isn't connected to a Microsoft Account. The exact nature of the information being sent isn't clear—it appears to be referencing telemetry settings—and again, it's not clear why any data is being sent at all. We disabled telemetry on our test machine using group policies.
Furthermore the system is designed to bypass proxies. If there is nothing to hide - why?
And finally, some traffic seems quite impenetrable. We configured our test virtual machine to use an HTTP and HTTPS proxy (both as a user-level proxy and a system-wide proxy) so that we could more easily monitor its traffic, but Windows 10 seems to make requests to a content delivery network that bypass the proxy.
Let people choose! Let the ones that are willing to sacrifice privacy for functionality - keep it and respect the settings of those who turn it off. ..That seems to be the logical and reasonable conclusion.
More here