They can't become human, true. Thinking of machines as their own existence also demands that we think of apples as their own existence. Are they apples? Yes. Do they exist? Yes. But why do we need to think of them as anything more than that? If that is what you are trying to say about machines, then I agree. If you're saying something more, I disagree.
We only compare them to ourselves because they are the second thing that appears to be able to think. We already compare animals to ourselves (why? it's really mindboggling. We are not animals, that much is obvious) because they have the potential ability, in our view, to think like us. Even though they don't. That is a good analogy for AI to humans.
We will never reach that point with AI, and there are multiple reasons why. One of them is this:
a) Consciousness, or sentience, whatever you want to call it, is the only owner of mental states.
b) Mental states are things to which one has private access (I don't know what you are thinking and you do not know what I am thinking, even during brain surgery, the doctors have to ask the patient what they are seeing/feeling, because they cannot know it just from the physical brain)
c) Physical things are things to which no one has private access (We all can know something physical)
d) Therefore, mental states are not physical.
e) Therefore, consciousness is not physical.
f) AI can only be physical.
g) Therefore, AI will never have consciousness.