When we take ourselves to be a separate self, an I with an Other, then any talk of selflessness sounds mysterious, or even deluded, and maybe as a reference to some sort of annihilation or dissolution. (The best we can hope for is a union with the absolute, an I here in union with God as Other.)
But even a mild taste of selflessness, for instance through the Big Mind process or the headless experiments, shows this to not be the case. The only thing that is different is that the sense of a separate self, placed on this human self, is gone. What is left is what is always there… this wide open field of what is happening right now, as awake emptiness and form, yet with absolutely no center and no separate self anywhere.
As Meister Eckhart said (paraphrased): when I am gone, God is.
Apart from tasting it on our own, maybe the simplest way to look at it is that God is all there is. God is awake emptiness and form, an I with no Other anywhere.
This awake emptiness temporarily takes itself to be a small segment of form, most typically this individual at the human level, and sometimes even at the soul level. There is a belief in ideas, including the idea of a separate self and various identities defining who and what this separate self is. The seamless and centerless field is now split into an I here, located in the region of the perceptual center of this human self, and Other out there, as the rest of the world.
When it awakens to itself as this field of awake emptiness and form, absent of I and Other, then it sees that the whole sense of a separate self only came from taking an idea as true. It temporarily took a relative truth, the existence of a somewhat separate individual at human and soul levels, and tried to make it into an absolute truth, and in the process gave birth to a great deal of drama and excitement. The whole human drama, as we know it from our own lives, societies and cultures, all came from this temporary misidentification.
Nothing is annihilated or dissolved, apart from the taking of a relative truth as an absolute. This individual is certainly still around, at human and soul levels, with all its sensations, thoughts, relationships, actions in the world, and everything else. The content of all of this does not need to change. The only thing that changes is the sense of a separate self placed on this perceptual center, which, when released, reveals the wide open field of all of it.
The bottom drops out of it all, revealing only a field of awake emptiness and form, without a center, absent of an I with an Other.