To a point, I agree with you. I believe that there is a time and a place to chalk things up to being one of God’s mysteries. And you are correct in my view that it is one of the beautiful aspects of the Eastern tradition.
However I think you take things a bit too far in your analysis. For example, I would say that one of the things I find that I love most about Catholicism is that there is (to use your words) a need or even a desperation have everything spelled out. However, I would further suggest that this does not have to be viewed as ego, nor does it imply a lack of trust or faith in God. It can simply be viewed as a yearning desire to know more about Him.
Just as it is difficult for one person to love another if they do not know them, it can be hard for many people to love God in the manner in which they are called, without seeking some understanding of who God is. The study and contemplation of God and His mysteries has led to the development and writing of some of the Catholic Church’s greatest saints. Saints Bonaventure, Thomas Aquinas, Augustine, etc. all spent their lives trying to understand God’s mysteries. Were those lives wasted? Did they do it from ego, or a lack of faith and trust? Or, as I am suggesting here, were they simply trying to know God more fully and through that knowledge, love Him more deeply?