I honestly have very little to relate to in this post. I have never in my life posted TL:DNR on anything I have been asked to read in the entirety of my academic career. From a purely academic standpoint, baring expressed page limitations for assignments in which case professors or fellow students could be said to be within their rights to forego, I find this sentiment extremely rude and counterproductive. I think a more accurate term instead is TL;TB (Too Long, Too Boring); but if someone does not or cannot be bothered to engage with your work on some level, even if it means skimming until the very end, then they only have themselves to blame for their dissatisfaction in the end. The point of reading something, especially for someone else is to give them ideas about how they can improve. If you never read, how can you suggest meaningful improvements to make it more engaging if that is what it needs?
For myself, there have been several papers and assignments of others that were about as entertaining as watching paint dry as far as their overall style was concerned, but I still read enough to grasp what was important, so that I could make those suggestions. People who simply write out TL;DNR are shirking their responsibilities not only as readers but as critiques; it gives the impression not only that they are bored, but that they are lazy, unwilling to take the time to truly analyze and give voice to their objections; if they write something to that effect who is to say they read the piece at all in the first place?
Good working relationships, no matter what the project require reciprocity. If I felt like my school readings were too long and dry could I simply put TL;DNR at the top of the page of every in class quiz over the material? Of course not. Doing such a thing would not would not only indicate failure in the general sense of making an excuse, it would also indicate an extreme lack of personal responsibility and initiative.
All this being said, the working world can be somewhat different, especially when it comes to advertisement. In this sense it is very much the business owner’s or agency’s responsibility to ensure short sweet and simple on every piece of ad or flyer. 1. Because it is an investment on their part and 2. There is no real concept of obligation in selling goods. Consumers do not have to buy your product, they have a choice and competition to go elsewhere to, thus the producer has the responsibility of making sure what time they have to spare is not wasted when it comes to reading your ad or finding out more information.