That formula is pretty shocking. I’m sure if most priests actually did that, the faithful would experience different homilies. I have a hard time when I hear a priest ask our school kids random questions, and then perseverate on any topic, such as sports, Greek gods, favorite foods, etc It can go on for 10-15 minutes, which has nothing to do with the readings.
Corpus Christi we spoke about types of waffles, what types are peoples favorites and where they originated. I would have appreciated hearing the sequence for Corpus Christi, or more related to actual readings.