No, the question is what was Jesus doing by re-calibrating and upping their (clearly to Jesus) deficient understanding of marriage?

He was calling for an even greater response from husband and wife.  Totality of gift. Kenosis.

All their heart, mind, soul, and strength.  Self-emptying love, as on a Cross.  Happily so too!

A mind blowing love, sort of like God's love for us.   "Beyond reason".