'it 'TRACKS' is probably a bit hyperbole since it's really just the first shot fired that homes in on the target, as already pointed out. that's certainly very strong, especially considering the minimal input required, but it's still far away from firing heat-seeking missiles as the thread title would suggest. delay the reverse or queue a short stop into the retreat path and cb will miss your mobile arty piece.
that is not to say this shouldn't be looked at/changed, but it's also far from game-breaking.
Ill go as far to say you could use this to your advantage and draw the lefh away from your main forces to advoid collateral damage with its stupid aoe. Harder to do on narrow maps but possible, anyhow should be changed