apiUtilities is redundant and just creates more interface to support, only a few examples use their "utility-like" functions as shorthands to create objects. They are also not used in any of our projects and I would highly caution using them anywhere.
The plotter utils aren't significant. If anything they should be absolved into a greater IO module. For now, we could move them to an example which could be referred to later if one wanted to write these files.