Local Experience Packs: What are they and when should you use them?

I really wish Microsoft would stop "fixing" things that already work, particularly when you don't provide a viable solution to implement them.  We are deploying operating systems using SCCM OSD, and I have yet to figure out a way to make the old or the new solution work.  We were planning on moving from 1803 as our standard image, but this is holding us back. Our requirement is Win 10 en-us with the option to install languages based on user need before installing the rest of the applications in a task sequence.

It appeared that I could use the S4B, select the German LPX, and use the offline version which packages up with SCCM nicely.  But alas, the install fails because a prereq is missing, and I haven't a bloody clue what its missing.

And before you say, just let the users install it, sorry that doesn't work, because language sensitive applications are effected by it.  We also can't use Intune and Auto Pilot, well because it doesn't work, particularly with dependencies.  Like install German before installing Office, and install Office before adding WebEx components.