Hello Trevor, your philosophical take on this is classic but optional..
The Bible is a book which has endured by concentrating on the past and the future. It warns against such a philosophy as mine because living for the moment makes it’s teachings redundant.
My philosophical take on this is that while we only have the "moment" now, you still can choose what you do. You can be good or bad. All God is saying is that if you continue to do good in your "moment" then you will get another moment.
As far as the angels go, they don't have defective bodies and so there's no real age limit set on their lives as in the case of animals and plants. But they were created "mortal" along with their free moral agency. Thus the only ones God gives "eternal life" to as a guarantee are those who past the test and those who past the test must be willing to die for God's cause and policies. Thus it is said that he who tries to hold on to his life (for the moment's selfish pleasures?) will lose it. He who lets go of his life for the sake of the kingdom will get it back.
Thus, those who give up the "moment" gain eternity. Those who try to hold onto the moment, lose eternity.
God's offer of eternal life addresses the "greatest love of all" and that is to love yourself. Why cut yourself short? When you choose God, over everything else, your family, wealth, whatever, then you are choosing YOURSELF over all. Serving God is the best personal choice you can make. Choosing the moment means you make things or passions, whether people or activities your "god" and those gods will eventually kill you. And without life? You have nothing. And that moment is forgotten. Satan thinks the glorious moment is better than the eternal compromise. God understands. Accepts the rejection. Allows the moment within reason, and then that moment and that person is forgotten by those who choose eternal life.
Your argument becomes a moot point though, when if each of us is given that one moment, an we can choose God or Satan, those who choose God out of preference to God are the happy with their choice. The extended life is just a perk....a very BIG perk!
The way I look at it, people willing die for causes all the time. Why not die for God's cause since it is the more noble of causes? But especially since you can also get eternal life? There actually is more to be concerned with than this moment after all, no?
JC