Yes, texting is easier than actually calling a woman, no doubt about that. Nothing wrong with sending a simple “I had a great time with you” or “Good night” every now and again either. But trying to have full-on text conversations instead of calling is another story altogether. You may think your “How R u?” is a nice way to let her know you’re thinking about her, but she’ll most likely see it as a sign you’re either a) immature; b) lazy (which the “How R u?” abbreviation certainly doesn’t help); c) scared; or d) not that interested. Besides, you’re denying her the pleasure of hearing your deep voice.
Good rule of thumb: When texting a question that requires much more than a ‘yes’ or ‘no’ answer, you may want to consider whether you’re sending the right “message”.