the point is nothing about his base attack but the possibility.
if not good enough attack-buffing troop is yet in game, im sure there will be sooner or later
stormhammer is the "tankiest" tank, or at least suppose to be, that doesnt mean he has to also hit hard.
anyway its just too many advantages if he cannot be entangled neither frozen on top to what he already does
you mistake "weakness" with "linsufficient strong points"
the weakness means vulnerability to significant negative effects
lack of strong points not necesarely equals to that, and in stormhammer case it doesnt.
he is tanky and resistant enough (besides the lack of resistance to instant kill which is needed but not present in game), he doesnt need to have an ensured and unstoppable way to be also very dangerous
do you realise he doesnt mana-block courage?