Hello BillClark,
All in all, these are the list of updates I wouldn't consider necessary (as required):
Windows 10 Dynamic Update: This install optimization dynamic updates in prevision of a new release of the version. All this updates will be included in the new version as well.
Windows 10 GDR-DU: The abbreviation stands for General Distribution Release – Dynamic Updates. These refer to packages for the dynamic update of the current version of Windows 10, while Windows 10 Dynamic Update is responsible for all releases.
Windows 10 [*] Upgrade & Servicing Drivers: Also for Dynamic update. These products are available for Windows 10 in general and also for every release.
Language Packs: Depending on your region or users, you may not need it at all. Other option (due to the small size of these) is to enable the users to download on demand per user basis.
Windows 10 Feature On Demand: Features on Demand are packages only required if you have a specific need for it. The first thing that comes to my mind are the Mixed Reality feature and it's updates, which is useless unless you have it. I would recommend not to activate for WSUS, only if required in your environment, and this should be selected by manual approval of updates, which would also require management time.
Windows 10 GDR-DU FOD: This refers to Features on Demand relating to the dynamic update of the current Windows 10 version.
Hope this helps clarifying your question,
Best regards,