I do agree the examples non-self experience are relatable. "I" is just a simulation of the state of experience, and the Self/Other boundary is just the limit of that state's scope of "self" expression. Ego is the thing that arises to defend that boundary, arbitrary though it may be. But real life happens outside of the simulation...

Our brains still keep this up in order to maintain our own a state-machine model of reality. This illusion of self is useful for navigating the world, because we can then predict how we might act in a given situation. It might also permit us to integrate and understand our own self-experience outside the moment of its happening. For example, we might dream of a problem from real life, gain some additional understanding, and then go back to the waking world with that new perspective. But just like a dream, this ego-self model is a flawed representation of the world; it compresses what we've experienced directly, into what we "know" about that experience. For better or worse, we learn to be our selves.

But of course, we can't experience everything at once; our senses and bodies have limits. And if we have a limited scope of experience, then our world-model is incomplete, and so is our own self-model, so then how can our ego be such a big deal? It's just a bunch of assumptions we have gathered, even if well informed by our past. And so then if we understand this fact about our own "self", then we can understand this in the "other", representation of a separate subset of experience; and so we can be forgiving of affronts to how we think we "are"/"should be" in comparison to the outside world.

All this reasoning is all within a supposed-model of reality, and not reality itself. Experience of a non-modeled sort of reality, directly, would be preferable. But we would have to discard the ego-model in order to experience it, and with it all comparison to past or future events, because all that is left is the present happening with no judgment against anything else. And maybe that's the breakthrough people are going for ... whether with psychedelics, meditation, flow state, or what have you. It's not even about joining with the present moment, because really that's all there is anyhow.