At the risk of stating the bloody obvious.................
The Falklands Air war belonged to the Navy.
The RAF Black Buck stuff was a blatant attempt to get 'in on the action'.
Strategically................a non-starter.
Tactically...................as above.
The only points it scored were politically, against the RN.
Bluntly. What did it do that a local Harrier or SHAR could not have done?