You should learn the difference between what is impossible and what just has not happened yet. Much science-fiction that was in the realm of possibility is now science-reality. One should not need reminded they are communicating at the speed of light over a global communications network capable of reaching billions of people at a time. I'm sure at one point in the past that was science-fiction, now reality. I don't believe you can show me any science that points out why AI/AGI/ASI can be created, we simply are not at that level of sophistication.
Science fiction turns out to be true when physical reality agrees that it can be true. This again, is why we have a global communications network and personal wireless devices connected to it. This is also the reason we do not go faster than light.
The reason we don't have flying cars is they are completely possible. They are also terribly dangerous and expensive and a complete waste of energy.
The reason we don't have AGI is not that it is impossible, again if nature can create it, we can recreate it. Since we don't have a good understanding of the networked nature of emergent intelligence we cannot create a power optimized network that would allow us to create a energy efficient version. AGI itself is a complete waste of energy at this point. We already have many types of AI that are energy efficient and used in products now.