Support SQL Always On AG Asynchronous-commit
Configuration Manager Current Branch (1602) Supports SQL Always On Availability Groups, however it only in a Synchronous-commit replicas.
Asynchronous-commit mode. This availability mode is a disaster-recovery solution that works well when the availability replicas are distributed over considerable distances.
Synchronous-commit mode. This availability mode emphasizes high availability and data protection over performance, at the cost of increased transaction latency. A given availability group can support up to three synchronous-commit availability replicas, including the current primary replica.
This means that Configuration Manager can only support 3 secondary replicas in a SQL AO AG and they need to be in the same datacenter. Without the ability to support Asynchronous-commit replicas we cannot have replica groups that are Geo redundant and offer a more complete disaster-recovery solution. For many customers who use a different datacenter for the disaster recovery model the Synchronous-commit does not offer any improvement in recovery as a database would still need to be restored and a ConfigMgr Site Recovery still done. Having the option for an Asynchronous-commit can help to reduce the recovery time of Configuration Manager in the event of a disaster.
Another option would be to support Distributed Availability Groups for SQL 2016.
ConfigMgr now works w/ Assync commit.