I don't like US' style of hiding everything because of possible risks.
People should discuss the hiring process more, it will cure the broken hiring of our industry.
By talking I want to explain the big reasoning model behind our model, see people feedback (even in complex case like here).
I believe that it is professional to be open and “offer private feedback to OP and move on” is corporate bullshit (nobody will do anything and average hiring is broken as hell) and not really professional thing.