It doesn't suit everyone and might seem alarming. Also we sort of play the game with the underlying attitude that it is all unimportant and that we admire and like each other.
The mind changing never happens then but sometimes it happens a few days later.
I HATE changing my mind but usually after I have I'm glad I did it. It's very uncomfortable but to say that nothing can change what I think would be to admit that I wasn't thinking anymore. It would be awful to be like that.