The Church is teaching the priest who he should be

Fr John Zuhlsdorf on the washing of feet at Maundy Thursday

The Church is teaching the PRIEST who he should be. The priest, as your servant in your parish, shows in his words and deeds and instruction also how you should be to each other. The priest forms you lay people. However, this time you are being allowed to watch part of the priest’s own ongoing formation from Christ Himself in action in the Church’s liturgy. You are witnessing your priest being shaped into the kind of priest Christ wants for you.

It's a great thing that priests like Fr Z are using the internet so effectively in their role in forming the laity.