Just a final confirmation -
Yep - I just updated my iPhone 4s to iOS 8.4.1 using iTunes 11.4 on 10.6.8 (Snow Leopard).
Accessibility of the phone from the PC appears pretty much as it did with iOS 8.3. Some things that still bug me are iOS issues, not Mac/iTunes - i.e. sharing of iBooks content, Safari resets on some web controls, poor background app execution - especially those maintaining a VPN connection.
However, these do not represent a change and have been ongoing since iOS 7.
So the whole iOS 8 emergency didn't exist.iOS 9 - who knows. I'll post about that once it's released.
That's fine and all. Glad everything worked out, but understand this is a hardware forum for Mac Mini's. Discussions about iOS X.X working with OSX 10.X.X should be done in other forums within Macrumors.
Thank you.