I understand your initial point that states of minds are being defined as a 'mental' illness.

To be honest, I believe how one reconciles their mind, is the ultimate factor in regards into ones being. Like a cup of water, the mind must not be left to set for too long, for it shall surely stagnate. And indeed we do see minds stagnate when not stimulated in a positive manner.

So again, I would say that how one handles their own being, is what matters most and maybe these inner divisions of self-consciousnesses, or reflection, is the true philosopher stone.