A rock still lacks just about every function we associate with life.
So does an atom in your body. But your body is still considered to be alive. A rock may lack whatever it is you consider to be life, does reality? Reality produces life pretty much wherever we look for it. In a way, can't it be said to be alive? Depending on what you consider life and reality to be.
Maybe the concept of life is useless already. You are made up entirely of "nonliving" materials that happen to be organized in a way that allows you to grow and reproduce and define yourself as alive. If we built complex robots that could replicate the functions of biological life, would the robots be alive? Or what if they couldn't replicate every function of biological life but could at least build more robots, and they were intelligent enough to consider what life is - would they consider themselves to be alive in some way? Would they consider the concept of life to be useless or pointless?
I understand what you're getting at. "Life" is just a word used to differentiate between things like mice and rocks. But I think it can be more than that, to some people.