Note: Comments in MySQL Bug #50413 suggest that innodb_autoinc_lock_mode settings 0 and 1 are equivalent in this respect. I’d also like to know whether this parameter is at all relevant outside statement-based replication (that is, when innodb_autoinc_lock_mode=2 could be safe to use). With the setting 2, InnoDB does not acquire any auto-increment lock within the transaction. With the settings 0 or 1, InnoDB will hold a lock until the end of the current statement. This would suggest that the setting only matters in statement-based replication.
He wants to remove the innodb_autoinc_lock_mode system variable. For that to happen, the dependency on this variable would have to be removed for replication and binary logging.