Most Helpful Guys
Short term bad, but longterm good.
If overnight this happens a lot of lives would change in one day. a lot of problems today happen because of a lack of communication. If all thoughts/intentions were known, without you trying. All your thoughts would be tinted with your intentions. So even if someone heard something they didn't like, they would also still see the place you're coming from and better understand you. They would still see that you love them.
This would force people to align themselves with people they truly get along with, trust and people you spend your time with would be the ones you truly resonate with. You would spend less time with those you feel like you have to, or just as possible. People you didn't like before you might realize you're a lot more alike and the relationship would be improved because of it.
Cheating would still happen tho. The reasons people cheat vary
That would backfire way too easily. Some thoughts would be humiliating if heard. Plus kids could hear “mature” thoughts from adults.