Though the faithful may not be aware of it, mystery actively reinforces reverence in the hearts of practicing Catholics. Mystery cultivates reverence behavior that demonstrates profound respect and honor for all that is holy. Reverence demands that holy things receive special treatment and handling. Although approved by the Church, receiving the Eucharist in the hand is not special behavior. It is familiar behavior.
People feed themselves daily.
There is nothing special or mysterious about handling a piece of food and putting it in the mouth to eat. Touching food makes people familiar with what they are about to eat. Should there be a question about a certain food, handling it is one means to decrease the mystery. Familiarity, unfortunately, spawns complacency. Complacency becomes manifest through irreverence.