I do not have the information to even begin to describe what i mean by probable other dimensions....sorry...wish i did.
Expressed in another way....when the focus of our attention is consumed by the desires and chatter of our egos, it is to the exclusion of everything else in the universe which being such a very large concept , may well contain many very different models of reality and its rules or dimensions..would any of us choose to be unchained from the inner cave wall if we suspected what llies outside the cave.Not with our egos intact i suggest.

Getting back to your initial post nihil...perhaps the ego does not offer us liberty at all.Perhaps it chains us to physical dimensions and actually prevents us from realising our true nature by making us focus on the physical at the expense of so much more.

As you say Madfool the ego" realizes its own insignificance". It serves us in order for the physical body to survive in our physical world.Yet often holds us back spiritually, mentally and physically. Perhaps the ego serves us to protect our physical form but when it is allowed to dominate our conscious self our ego can blind our other senses , leading us to believe that it is our true self..Our ego may be necessary in order for us to prolong our lives...but prolonging life at any cost .Perhaps our ego like a horse pulling a cart should be carefully controlled. At least a carefull balance attained and an ability to mute the ego's voice is perhaps advantageous..While not being the true self, perhaps the ego is a real construct..How to control the ego may be among our intrinsic goals as humans.