The ban isn't about getting reads on opponents.

The reason for not allowing showing in a tournament is that every player whether in the hand or not has an interest in the hand and the outcome. I agree that WHEN THERE IS NO FURTHER ACTION TO COME A PLAYER SHOULD BE ALLOWED TO EXPOSE THEIR HAND SINCE IT CAN'T AFFECT THE ACTION (that being said I truly believe that the vast majority of people who pull this stunt are in capable of getting a read on their opponent anyway - but they think it makes them look cool).

I was just pointing out that The TDA rules which are among the most widely accepted written rules of tournament poker do not allow this practice. Personally if I was making the rules this would be permitted in these circumstances (however the player would be subject to ridicule).