Although Airbus is equipped with a wonderful CLIMB mode equivalent to Boeing VNAV , it says From Airbus FCOM PRO-NOR-SRP-01-40 P 5/10: Monitoring the Climb phase:
"Recommendation:To ensure that you will not miss the next constraint, it is recommended to select the FCU altitude to the next constraint as described above"
Also as previously stated in case of reversion to V/S due to TCAS TAs or reversion to Heading to avoid Weather , you would have a level bust. In heading mode the system cannot follow the vertical profile in Airbus