There are hundreds of millions of galaxies and billions of planets. That is an immensity that is beyond the conceptual concept of most people. It is logical to assume that the universe teems with life. Yet given the huge distances separating these platelets and the laws of physics, it is simply not possible for an alien biological or a mechanical entity to visit. However Earth has been transmitting huge amounts of digital alogarithmic data for the past twenty five years. It is not inconceivable that within the next twenty some computer on earth will receive a truly wondrous communication.
Except for the single irrefutable fact that there is no evidence that life exists anywhere except earth. Not a single piece of data.
Now I GET that our ability to search for life is limited by technology to a certain sphere but that doesn't change the fact that we have no evidence for life anywhere else.
Of course, the Milky Way, vast as it is, is only one of hundreds of billions of galaxies that are known to be out there...so far.
No doubt that there are many other planets teeming with life out there, some more primitive by Earth standards, others way more advanced. Even the ones that are far more advanced will probably never develop the technologies to make contact with this little outpost called Earth.
“Yet given the huge distances separating these platelets and the laws of physics, it is simply not possible for an alien biological or a mechanical entity to visit.” IF you limit your Physics to the point of declaring that we now have all the knowledge we will ever have regarding life, luminal speed, and dimensional reality, then your bold assertion is true. BUT I don’t believe you are in possession of all there is to know.