Oh! One thing I thought of when I heard this but forgot to mention:
Most of the effects of the change in this world from ours would be negative--from the potential to use words to attack other people (imagine a tough sports rivalry, you can try to prevent weapons from being taken in but what are you supposed to do, duct-tape people's mouths shut?) to the potential for unintended harm to oneself or others.
But one area that I could think of that might make a positive difference is in better understanding when things that you say are unintentionally harmful to others. Such as what I've heard referred to as "micro-aggressions" where a stranger or casual friend makes small remarks, often along racial lines, that aren't intended to be insults but end up being that way anyway. Any one of such is a minor but irritating wound, but which added up day after day month after month year after year become horribly draining, and which each on its own the recipient may not feel comfortable commenting on because it puts the other person into a defensive mode in what otherwise might be a pleasant conversation. And maybe some people who say these things wouldn't care, but for an empathetic person who hasn't considered the effect of certain statements, if they are speaking casually and suddenly the other person develops a minor cut, maybe the person speaking would apologize and try to understand how they'd hurt the other person and could maybe even try to learn from it and try not to commit it in the future.