Such ego and delusions are results of mind wandering outside of the context provided by the instincts and senses.

No.

The ego-sense is the Mind in its capacity/function as self-identification. Its is called Ahamkara (https://en.wikipedia.org/wiki/Ahamkara) and is an aspect of Antahkarana - https://en.wikipedia.org/wiki/Antahkarana. It is fully capable of creating delusions from external (i.e. objects through the senses) or internal (i.e. objects through its own imagination) means.

	▲	zkmon 5 hours ago \| parent [-]
		Looking at biological evolution, purpose and functioning of instincts and senses is more useful and more grounded than abstract philosophies, in my opinion. We don't need to analyze mind and thoughts in a manner that is fully disconnected from biology. Mind is just an orchestrator of responses by processing of sensory information, memories and instincts. Actually, such processing and response can happen throughout the body as well to a limited extent.