SDKs by their nature are effectively recipe books, except they’re object oriented computer code languages. So, not really simplified no matter what.
Add to that the more Arcane 3D art work which is an entirely separate workstream and you have a very complex and technologically intense framework in order to build a SimObject (i.e., plane, airport, etc).
In order to mature FS’20 into '24, many things in that book had to change. And they’re still being developed, so add a bit of concurrency into the mix.
TL:DR there’s no simplifying how to make content for the sim.