In 2018 the NCAA made a major change to their NCAA Tournament selection process by finally doing away with the archaic RPI system they had used for decades and implementing their own system called the NET. Unlike the RPI which was a single metric the NET took multiple data points into account when evaluating teams and the rankings it put out were official in the eyes of the selection committee. Simply put, the NET is extremely important and therefore any alteration of it is significant.
For that reason it was rather large news on Monday when the NCAA announced that they were drastically changing what went into the NET formula.