An expected disadvantage of this variable cycle system would be increased complexity and weight. GE claims to have combated this by using simple pressure driven valves rather than complex mechanically actuated valves to divert airflow.
A possible drawback of the proposed variable cycle system is its potential for increased complexity and weight. General Electric (GE) has countered this issue by utilizing simple pressure-driven valves instead of complex mechanically actuated valves to manage air flow.