Features and functionality removed or depreciated in Windows 10 (version 2004)

Just released are the details about features and functionalities that were removed in Windows 10 (version 2004). 

The list below provided via the Microsoft post is subject to change and might not include every affected feature or functionality.

FeatureDetails and mitigationRemoved in version
CortanaCortana has been updated and enhanced in the Windows 10 May 2020 Update. With these changes, some previously available consumer skills such as music, connected home, and other non-Microsoft skills are no longer available.2004
Windows To GoWindows To Go was announced as deprecated in Windows 10, version 1903 and is removed in this release.2004
Mobile Plans and Messaging appsBoth apps are still supported, but are now distributed in a different way. OEMs can now include these apps in Windows images for cellular enabled devices. The apps are removed for non-cellular devices.2004

You can read the full post to see the features that were removed from versions 1909, 1903, and 1809, and prior releases.

There are also features listed via another update that Microsoft is no longer developing (depreciated features):

FeatureDetails and mitigationAnnounced in version
Companion Device FrameworkThe Companion Device Framework is no longer under active development.2004
Microsoft EdgeThe legacy version of Microsoft Edge is no longer being developed.2004
Dynamic DisksThe Dynamic Disks feature is no longer being developed. This feature will be fully replaced by Storage Spaces in a future release.2004