When is a destroyer not a destroyer?

[Tarrasque]

Well even if the Sea Viper was operational, it, like the Type 42 before is extremely limited in what it can do.

Very limited anti surface capabilities. Even more limited land attack capabilities and horrific anti sub capabilities.

Thought we'd learnt in WW2 that hugely expensive specialised vessels (read battleships) were ineffective and far too easily sunk.