??, Statements which may or may not be correct:
By my limited understanding, a Factory is part of a user interface method, which connects Javascript .js and also .html, to MoI proprietary C++ code.
The associated C++ code is the factory / does the work of the factory.
Javascript code creating the factory, is inputting parameters into the associated factory C++ code.
With the factory, the user can access, or instruct, the work done by the C++ factory, with Javascript .js code. (Within the limitations of the factory instructions/inputs.)
As users, we do not directly mess with the C++ code. It is proprietary, and not permitted by user licensing agreement, which is as it should be.
Programming the C++ code is Michaels prerogative. (I wouldn't have a clue how to do c++ programming anyway :-) )
???
It is nice to be able to do Javascript scripts, to accomplish other tasks.

There is other user interface code which is not a factory. (?)
There is other, non-factory, interface code, which could be useful when creating scripts.(?)

I guess that API documentation, or Scripting documentation, is/ could be/ should be, more than just Factory documentation?

- Brian