Ego does not have to dominate, and it can and does dissipate, that is the point and purpose of all genuine spiritual traditions. Then like the cloud lifting away from the ever present sun, the aspirant can bask in its ever present glory/warmth of Truth/Universal Self. Getting to that stage is the "work" so to speak and speaking for myself, if you are not consistent, it can come back. Doesn't make it untrue though nor the beauty of the sun any less
YMMV.
BT