@riot Nasus spirit fire a simple question/suggestion

Why can't we cast E while moving including the addition of his casting animation.

gragas can move while drinking (casting animation) i know it's because gragas went into a remake but nasus has been there longer and no one though about it and by i'll be answering my own question.

casting E can sometime be a lifesaver for the enemy team a split second and they get away all in a fraction of seconds. i'm fine that you can't instant cast E but at least give us the privilege to move while casting especially when you have no gap closer movement speed or any sort mobility.