Depends what the communication is. Legal and social correspondence are still made by postal mail or in person. In fact, most social correspondence should be hand written on blank paper. Preprinted "Thank You" and RSVP are a social bane. The latter stemming from the fact that people are too inconsiderate to respond otherwise, but the etiquette folks will tell you, two wrongs don't necessarily make a right.
Text is fine to let people know in an asynchronous way of something fleeting (telling the wife I'm leaving the office now, or passing some other insignificant fact that doesn't entail an interruption).
Email works for most business and casual correspondence. However, electronic media doesn't obviate the need for being polite and using proper grammar, spelling, and punctuation. In fact, I expect more with all the tools that are available, not less. I'll accept some abbreviated fragments in text, but use sentences if you're emailing me!