It's been a while since I read much around this. I think some of the process rationale has to do with the subjectivity of creation, or something (so Whitehead)? But I am happy to learn from you about it.
For me, to see creation as part of the essence - the being - of God is to deny/diminish God's role as the free and generous creator of all that is. It makes God subject to the unfolding of creation rather than recognising God's sovereign rule. It places God alongside us rather than above us (or, perhaps more to the point, undermines the humility of recognising our own complete dependence and contingency on God).
And so on. I think you can see where I am going?
In process, the basic building blocks of the universe, the atoms, so to speak, are actual entities or momentary occasions of experience, drops of experience. Hence, Hartshorne stated that all things, in all their aspects, consist exclusives of souls. However, this does not mean that everything is conscious. Process emphasizes the fundamentality of unconscious experience. Only very high level creatures are capable of consciousness. This view is sometimes called panpsychism or panexperientialism.
I gather you have issues with teh transcendence of God in process. Don't worry many do. That's understandable. I don't know if you read a previous most of mine today that addressed that issue with another member. So, at the risk of repeating myself, here is the process take:
Many feel that they can put no faith in a God who does not predestine and control absolutely everything. In process, this God is seen as "too big." The problem is that of freedom. If we have genuine freedom, then God cannot predetermine or dictate all we do. God cannot decide our decisions for us. We have to decide for ourselves. God leads by luring us along, not forcing it. Democracy is about the worst form of government, until you consider the alternative. However, it takes far more talent to rule a democracy than to be a cosmic dictator. Hence, God is the ideal model of power, power over powers, participating in the free self-decisions of others. So, in process, yes, God is limited by the decisions of others, who can choose to what extent they will actualize God's aim for them. That means nothing can be guaranteed.
In process, the fact that God is transcendent does not mean that God is wholly other than. God is seen as the chief exemplification of all metaphysical principles, not their negation. For example, the principle of relativity (Whitehead) claims that all of reality is interconnected. Every entity is an item in the real internal constitution of every other. This means there is an empathy and omnipresence among all things. However, God transcends all creatures in that God is omnipresent in the fullest sense of the term. God enjoys a direct, immediate empathic reaction to any and all creaturely feeling. We, in contrast, are strangers to sensitivity on that grand of a scale.
Process understands God as needing the universe. For example, I argue that creation is God's own self-evolution from unconsciousness and mere potentiality into consciousness and self-actualization. Now, of course, the classical or traditional model of God went on the notion that God would be inferior if God had any needs. But I hold that is a prejudice about being needy. Was Toscanini any less of a conductor because he needed an orchestra? If teh most powerful have the most needs. So I have no problem in assuming God needs the universe. Actually, I see no reason why God bothered with it if God could have been happy, whole and complete without it as with it. If God doesn't need it, if God is not affected by it, then the universe is totally meaningless to God. Of course, some will complain I am presenting God as being very egotistical. Yes, God is egotistical, the most egotistical that there is, but God is also altruistic, the most altruistic that there is. We tend to naively assume egotism and altruism against one another, which in fact they go together. Since we are all social-relational beings, we cannot be happy unless others are happy. Thinking of your own well being is also thinking of the well-being of others. Just thinking about myself and worrying about my future is just as altruistic as it is egotistical. Moment to moment, I am a different person. Hence, to worry about my future is really to worry over the future of another person. Trouble is, we too often forget this. So the fact God needs us does not mean God can exploit us.