Javelin is heavy, bulky, takes longer to employ (versus an AT-4). One of the recurring themes in A'Stan is the issue of how much weight Soldiers carry and how mobile they are.

The elation that a PFC felt in OIF I upon destroying a T-72 with a Javelin was not along the lines "woo hoo - I just made a big bang." Rather it was "thank you, God, I no longer need to carry that awkward sonovabitch."

What is the added capability that you get from a Javelin that you cannot get from a few extra rounds of 40mm HE or an AT-4 (other than added range and a bit more precision)?