For most air forces your statement applies correctly... for the PAF the mirage 3/5s serve as the same exact utility as the B-52s do for the USAF ie Bomb/Strike trucks. Believe me the Mirage 3/5 holds such a position in the PAF that if they had their way it would serve for another 30 years via continued upgrades to structure/avionics/ and even engine.
Forget even ground targets, you know very well a few mirages equipped with ASCMs would rain hell on any navy, and could pretty much close oil trade through the straight of hormuz. Argentina only had 6 mirages and 6 excocet cruise missiles and was able to hold the royal navy at bay. Pak has hundreds of mirages and thousands of cruise missiles.
Its our old school jugad weapon. We may retire even the A5s, F6s, and even F7s, but we will hold on to our forever customizable bomb trucks= Mirage 3/5s