If your organisation uses BitLocker's PIN protectors as part of it's encryption strategy then you'll soon find out that it becomes a small obstacle when you're doing a Refresh or Upgrade deployment. The problem lies in that the default Disable BitLocker step is inadequate for Windows 8.1 and Windows 10 and how those operating systems suspends BitLocker.
In Windows 7, when you suspended BitLocker, it remained in a suspended state until it was re-enabled, either using the command line or GUI. That behaviour has changed in Windows 8.1 (I didn't get to test Windows 8 much so perhaps it