Decorations can sometimes be helpful when your readers are non-scientific.
Say that your anniversary is coming up, and you want to draw a plot to make your spouse happy; you know that red and only red is their favorite color. To impress your spouse, you create a line diagram showing how your love for them doubles yearly. At this time, if you draw a plot with a light red background, red line diagram, red dots, red rose, and red teddy bear, your visualization is highly effective. It has done its job. Perfectly!
Decorations matter! Decorations help us remember a plot!
Decorations reach deeper into our minds and help us remember the visual.
Decorated plots and charts are usually a good fit for “infographics,” “flyers,” or “brochures” intended for the general audience.
Decorations can also help a plot align with the story’s theme. For example, a chart showing an ‘improvement’ may be colored green, and one showing ‘violence’ may be colored red.
It is best to keep your visualizations naked for a scientific audience. However, decorating your plots to a certain extent may be acceptable for posters and video presentations.
No plot is evil! The context, audience, or readers make it effective or ineffective.