Yes, not being able to properly service win 10 images. Not even with ADK for 10 installed. Dotnetfx35 and 48 are separate versions, you don't need them to be both enabled, but some older software can have the need for the older dotnetfx35.
Dotnet4x exist by default in Windows 10 (not disabled and removed like NetFx3) you only need the updates for it (or newer version of it)
Ok, so its not a recommended OS, its a required OS if it cannot be done on Win 7 with the appropriate dism files?
Yes, but 2016 LTSB x86 needs a fix* (mentioned in the W10UI OP) before offline integrating updates (7.7 is the current version). * https://forums.mydigitallife.net/threads/windows-10-hotfix-repository.57050/page-476#post-1565359
The New Edge is a stand alone Product BUT Updates will be on Windows Update. It is NOT tied to any Windows 10 Version.
I had seen that it would be "integrated" in the next Windows (20h1) like Edge and IE It is therefore not possible to integrate it into ISO (1903/1909)