@dshall, thanks for your likings.
I understand that this extensive plumbing diagram is not 'required', however I like to provide it to the plumber because why not?
This way everyone can see where the pipes run, and that they do not interfere with any other mechanicals so there is no surprise change orders because of a lack of forsight on my part of where the plumbing needs to run.
I have designed some kitchen and bathrooms purely based on an aesthetic performance and the plumbing lines were a mess running in every direction, interfering with everything because I did not look at the big picture from the start.
When I design a plumbing diagram like this, I am always able to optimize the design and flow, minimize materials and ultimately cut costs. Since I am the designer and the developer, that is a priority for me.
Usually "designers" just want it to look good, and do not necessarily have forsight of what is behind the walls.