People missing keypoint – mass.
Air targets are fast but way more vulnerable if hit. Thus we need rocket which can be faster and can change dirrection fast too. This cannot be achived if payload is heavy. Majority of AA rocket mass going to fuel.
Ground targets like tanks are slow but durable, thus a lot of explosive payload is required. Majority of rocket mass is contributed to payload.
Another important thing – targeting system. AA targeting issuper easy comparing to ground targeting, that make proceccing unit lighter too
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