What is the reasoning behind spiritual teachers and gurus promoting the idea of having no ego?

There are many Gurus and many teachers who say many things, but what is the reason behind no ego? How can you have no ego? Ego is an identity. Every individual has to have an identity. Every human being has a name. You cannot have human beings without names. There may be a 100 pigeons on a tree that have no names. But we are not talking of pigeons or fishes in the ocean. Every human being has an ego. The challenge is not to have an ego. The challenge is to overcome the false ego that makes us think, ‘I am this, the body, the mind,’ and our aim is to realize, ‘I am not I.’ The ego has to be enlightened, because when we are enlightened, we are free from all misery on earth and the cycle of rebirth.