MicrosoftThat's an amazing guidance, thanks for compiling to everyone involved.
One things that comes into my mind, not mentioned yet, LiMiller
Monitor success and publish it internally to leadership and users
Intune provides amazing statistics about the boot process, performance and device stability. If your customers were previously using Windows 10 co-managed devices with hybrid or Entra join, you can use data to prove the success of switching a device from Windows 10 to 11 with Intune-only management, as this results in improved boot and user logon times.
In addition you can leverage the strong capabilities of the Microsoft 365 apps center (login required) repeating it for Microsoft 365 perfomance and stability metrics.
While there is no one-click report for each customer in the fleet, examples can be shared from the rich datasets.
One idea could be to use MS Forms to ask users about subjective performance improvements and post-migration satisfaction, and then correlate the data from users who were either very satisfied or not satisfied.
