It's useful for me because when my wife is working, we typically text before I turn in for the night (she works second shift). If I'm in bed reading and happen to be awake past my bedtime, it'd be nice to be able to check for texts without having to unlock and look for a badge on my Messages app.
Well true, but it would still show notifications as normal (without having to unlock), so while I like the separation, it’s kinda redundant.