What is the difference between approaching the idea 'no-self' and the act to 'depersonalize'? In modern days, 'de-personalization' is seen as negative and in some cases, a symptom of an emotional disorder.

In Buddhism, seeing through no-self/identity view is the minimum criteria to attain the first level of enlightenment.

These two concepts, seemingly similar; fundamentally, they could be different.

Question:


Are these two the same or not? Shall they be separated or mutually embraced in our daily lives?
As a layman Buddhist, how can we approach this ?
Depersonalisation as a psychiatric disorder is something traumatic.

Depersonalisation as enlightenment is calming, blissful &amp; liberating; based in the wisdom of seeing the stress &amp; abandoning of attachment &amp; aversion.

It follows the depersonalised enlightened person can act, behave or interact harmoniously in the world. 

The depersonalisation of the enlightened person can be a “secret” only know to them. An external person may never ever suspect or know the enlightened person is depersonalised; let alone enlightened.