I agree in principle, but I feel like the author might be missing the point; the reason "tldr" is used is because it has evolved as an efficient speech marker.

I agree in principle, but I feel like the author might be missing the point; the reason "tldr" is used is because it has evolved as an efficient speech marker. If you think about forum posting as a medium, then a "tldr" makes sense -- generally, you scroll down a list of messages. When you encounter a wall of text, you can either start reading (to see if you'll want to read the rest), or keep scrolling past until your eyes reach the "tldr" symbol, which draws you to the main "point" of the post without requiring you to mentally invest in reading the whole first paragraph.