Minor ESD causes defect and damages your device. ONE CATASTROPHIC ESD event is enough to bring down your operation and business!
It is dangerous to not knowing the likelihood that a serious ESD event can happen at your manufacturing / production / operation sites (e.g. explosion).
To cure the damages caused can be too costly and burdensome, and the only wise move is to prevent it all the way possible.
ASSESSING YOUR ESD RISK is what you need to do.