i've always thought that 'breaking the runway' was a 'nice to have' - the big points of doing the job was to get the Argentines to concentrate more on defending the homeland than worrying about the FI, and to get a load of conscripts and politically reliable officers to reconsider the wisdom of going to war with a nation that can put a strategic nuclear bomber over their heads a mere 8,000 miles from home...
i'm sure the effect on morale of watching a stick of 21 1000lb bombs going off across your newly captured airfield must have been something to behold as well.