I'm not quite sure what to make of this. Yes the whole has always existed, so it is a done deal in that regard, but there are vast changes going on all the time, which is a part of creation/destruction all at once, such as when two galaxies collide and changes everything about both of them. I do think you carry a powerful point that we only see a mere point compared to an entire universe however.
And, as usual, and I don't mean to bore people with this, but I find it so insightfully fascinating the more I read, I find in the Zohar ideas that we are creators along with God, that we are more or less partners in the process, because they view the creation as a process, which is part of what we ourselves are, yet we also get to influence it, along with God. I find that idea quite encouraging and interesting personally.