> graphics department (PowerPoint)
You started the paragraph with the word "workload," but here the load is about as close to zero for the average employee as one could get without being pedantic about it.
People aren't using virtual brushes and learning color theory to digitally paint their PowerPoints, or even composing their slides effectively in the visual space provided as a graphic designer would in Photoshop. They are writing and revising their drafts in PowerPoint, often using the default templates or perhaps 2-3 minutes of trying out different themes.
That ends up smearing all the costs and benefits of default PowerPoint look-and-feel across the audience for all these boring presentations.
But I claim the cost to the employee's time and education due to them technically having taken on the responsibilities of a graphic designer are, on average, effectively zero.