Yeah, when all authority is given to you in heaven and in earth, really, what can prevent your dominion?
Consider that heaven was also created so it is not eternal. Before creation, God was, the Word was, and the Spirit was. Heaven was required only "in the beginning" where "the beginning" meant God revealing Himself in time and space.
Even the arrangements in heaven seen by the prophets and in Revelation are for our benefit. Through them God shows us His nature, character, and likeness and also those qualities for those who are in Christ.
When you are "all-powerful" then you have no need save for any need you create for yourself. Also, because you cannot lie, then you are restrained by the words you speak. In the case of God, He determined to be restrained by the thing that ultimately benefited us: love. That is why, in spite of all His eternal qualities, WE, who are human, can truthfully say "
God is love".
From a man's point of view, this short statement encompasses ALL who He is. He decided, not man, that He could be known by that singular attribute.