Transition from SCCM Updates to WUB = Loss of control over major version updates?

Hi Jameswatson3, thanks for reaching out! 

With WUfB you will actually be able to select a specific major version (e.g. 20H2) and remain there until you change the policy. Additionally, we actually have a compliance deadline experience which provides the compliance you need with a good end user experience. 

• What documentation is available for managing this transition?
  • Check out Windows Update for Business (WUfB) docs and keep an eye out for a March Ignite talk on using WUfB
  • (Intune WUfB overview) Setting up Windows Update for Business via Microsoft Intune - Microsoft Tech Community
  • Configure Windows Update for Business via Group Policy (Windows 10) - Windows Deployment | Microsoft Docs
• What documentation or resources are available for monitoring upcoming major version update deadlines?
  • Update Compliance or Intune reporting Get started with Update Compliance - Windows Deployment | Microsoft Docs
• What features in SCCM/InTune are recommended for monitoring/managing major update activity and deadlines as well as computer readiness?
  • Desktop Analytics, Endpoint Analytics, Intune Reporting, etc. 

I am working on providing even more guidance. To check out the latest updates follow TechCommunity blogs or if you have twitter you can follow along there as well (@ariaupdated). Please let me know if you have any other questions.