It's more a generational thing Steve rather than anything else. I agree that to an extent the term University has been devalued but as far as most courses in the University of Glasgow are concerned grammar is still of paramount importance. My daughter who graduated with MA Joint Hons this summer regularly got dragged over the coals for grammatical mistakes. No bad thing, by her graduation the quality of her written work was unrecognisable by comparison to that of her first year.
I showed her the quote you posted and she just couldn't see the problem. She pointed out that the structure of sentences on social media is not reliant on punctuation but is more to do with the reader being tuned into the language and perhaps having a background knowledge of the subject being discussed.
What she pointed out was that this has to be treated as a face to face conversation that does not involve face to face interaction. She reckons that reading this she can sense the facial expressions of the author and that's what gives 'colour' and context to the words.
I feel very old