Text messaging is arguably the most casual form of communication available. Back when we all first starting texting on our dumbphones, the sort of shorthand style that developed was perfectly reasonable. Why strain to type out full words when a universally understood abbreviation could do the job just as well?
Now that smartphones are the norm, a perfectly punctuated message -- all its words spelled out in full -- is easy to craft but seems somehow contrived. Or maybe it's a relief and a very good thing. I don't know. I text different contacts differently.
Do you make a point of ensuring your text messages have correct spelling and punctuation? When is it OK and when is it not OK?