It's more how it tends to be phrased by the canonists who work directly for the Vatican dicasteries. I haven't managed to find, for instance, that "what is impossible is not required" in canon law. Or, in the article above, the dicastery's representative is indicated as expressing that a work obligation does not in fact excuse you from the Mass obligation.

Real-world canonists and pastors know these things. Laymen who have access to such people therefore know these things. But what about well-meaning laymen who happen to have pastors who don't care?

I just wish the Vatican could state these things more carefully. Otherwise it encourages despair through the dual issues of scruples and apathy.

Expressed in a more blood-boiling form: They bent over backwards so hard to accommodate blessings for individuals who were members of couples in irregular situations, can the Catholics who try to stay on the right side of the divine law get the same treatment?