I once drew something very much like this only it was a bit more comprehensive (and incorrect in a couple of places). It was also way back during OH 1.x. But it is interesting to see how different people draw the same concepts. I wish I could find it again. Lets talk about OH 2 Drawings . Scroll down and you will see a version that looks very similar to yours.
I did make this different layered view at some point too, I can’t remember why:
It is obviously missing the concept of a Bridge. I think I made it before that was commonly used.
One thing to note, if you want to make drawings for use in the docs, it was decided way back when that draw.io is the tool to use which will provide the raw editable files so others can edit it later.
I think a drawing like that could be helpful in the Concepts section of the docs. I don’t think it belongs in the PaperUI NG docs. Those should strictly “how to use” the UI and not cover the whole OH architecture. At least that’s my opinion.