Using the example from the article: "K let circle back nxt week bout it . thnks"
I'm not buying your argument. The amount of additional time that it would have taken to write that same message with proper grammar and spelling is minuscule.
Shorter answers don't necessitate terrible grammar. Maybe it's because my mom was a teacher and I had good grammar drilled into me, but I feel like it shows respect for the people you're communicating with.