Unfortunately, this also made it emotionally unpleasant for me to voice dissent/argue when I disagreed with something, especially when it was about something where I was the minority.

This is serious. I remember thinking of that. I hoped that our rationality memes and general sampled-from-contrarians makeup would be enough to counteract that. We will see.

The negative consequence I described may still happen, if many people adopt your rules and develop Affection for a large group of people they don't know well quickly.

Right. Humans are not rational. We may choose something bad for us voluntarily. I don't think my proposal is a devil's offer tho, at least not yet.