At the time, especially given the crucial engine technology, there was no way for Vertical Takeoff and Landing Fighter to break the sound barrier.
Only with better performing engines could there be hope for the Vertical Takeoff and Landing Fighter to achieve sufficiently excellent maneuverability.
Obviously, the technical state achievable at that time was certainly unacceptable for the Empire Navy.
Do not forget, among the ship-borne aircraft carried by "medium and small multi-purpose carriers," the primary mission of Fighters is Fleet air defense support, mainly through rapid interception against incoming enemy aircraft. It is unimaginable for Fighters to lack interception capability.
