Erjen Rijnders , from 1809 Windows can automatically enable BitLocker encryption for all devices, not just those that are HSTI compliant. This should mean no user interaction required (assuming you don't want a PIN)
nomeara , you can use the Intune Datawarehouse as a source for this information and archive it for as long as you require.
Jorge Otero all of the Enterprise SKU BitLocker management features are available for Pro SKU devices from Windows 10 1809, so silent/automatic enablement should work with recent Windows builds
jasonoakes , ping me your case number on Twitter (@ConfigMgrDogs) and I'll take a look. Autopilot should consistently set the encryption method assuming you've configured it correctly. https://techcommunity.microsoft.com/t5/Intune-Customer-Success/Setting-256-bit-encryption-for-BitLocker-during-Autopilot-with/ba-p/3237