The obvious one being your wife noticing you're at your mistress' house when you told her you were over at your girlfriend's, but outside of that, the problem the people that are positive about sharing their location is that it's also being abused by the abusive. That's a social problem, and not something technology can solve. I share my location with people I love and trust and will understand that I was busy and had an itinerary I needed to stick to and couldn't see them even though I was right next door, and if they ask we'll have a conversation about it that isn't awkward. Good for me but the problem isn't that I have good people in my life that I share this with, but that other people have bad people in their lives that they're forced to share it with, for whatever reason. I don't have an answer for that.