The voice limitation appears to be simply planned obsolescence; Waze can handle it without issues. This is a slap in the face to someone who paid a lot of money to Apple for a current-generation phone a little over a year ago.
Apple's closed platform has worked only because they've been able to give consumers such a high-quality experience. I think this fiasco will be a big wake-up call to lots of iPhone owners about how Apple's limitations can hurt them.
You can't restore from a pre-upgrade backup?
That's the cost of being inside a walled garden. You don't even have the freedom to install previous firmwares on your device.
But since the browser is part of a firmware upgrade it would be a terrible idea anyway, a new security bug has been found on mobile safari recently, you don't want to stay on older fimrwares if you can help it. Google maps, or a secure browser ? Pick one.