After fixing a "lists and ellipses" error, I turned to my husband and said, "This is one of my pet peeves, honey."

"intro text such as A, B, C, and D..."

Now, my husband is a good writer and an engineer to boot, so he caught on right away grinned. I didn't need to explain it to him.

What's wrong with this sentence structure? "intro text such as A, B, C, and D..."

The use of the ellipse in this sentence structure is redundant.

Such as: The words "such as" imply a non-exhaustive list will follow. "Such as" is equivalent to saying "including, but not limited to."

The ellipse: What is an ellipse? Three periods or dots represent the ellipse. The ellipse indicates omission and you can read it as “and so on.”

As you can infer, it is redundant to use “such as” and an ellipse together.

Which is better to use: "such as" or an ellipse?

I suppose this is a stylistic decision. I prefer “such as” and no ellipse. Marketers have overused the ellipse in an effort to show how much their products have to offer. My mind diminishes the credibility of what I’m reading when I see an ellipse.