How would you write an exhortation after a divided synod? Ignore the dissenters and teach what you believe? Ignore your own faith, and support the minority that disagree with you? Or acknowledge the diversity of opinion and assure all bishops that the diverse opinions reflect a common faith?
If the bishops of the world were to speak with one voice, the Pope could easily support them. When they cannot speak together, the Pope has to decide how to confirm his brother bishops in the faith. I think Francis made a good choice, despite the whining from Burke, Weinandy and others.