My view as one who believes the Bible is what it is because God made it so:
1. Matthew and Mark, in this instance, opened the door to the spiritual inclusion of those who would naturally be excluded. The law of love was shown as superceding the law of even Jesus' commission. An important rule to be remembered by all Christians.
2. It also highlights the all too evident superior qualities of the Gospel of John, a Gospel written for our day. In my opinion.