My point was pretty much exactly that, but you are seeing it from the point of view of Earth's chances of being hit as being "just as good" as any other body. I'm not disputing that at all - Earth is nothing special in floating rock terms. What I am saying is that the chances of Earth being hit by life-bearing extrasolar masses are infinitesimal, just as they are for any other planetary body in any other large star system.
If an object somewhere in the universe is suddenly accelerated, the chances of it arriving in our solar system are somewhat remote.
Assume it does, however: the chances of it then avoiding Jupiter's gravity well, the sun, the asteroid belt, the Kuiper belts, or just shooting straight out of the system again, and instead hitting Earth, are also somewhat remote.
The chances of any extrasolar object that makes it to Earth just happening to be from a body that supported life or prelife, or carrying organic compounds that could trigger life, any and all of which are required to have survived a trip of millions of years duration through goodness knows what harsh conditions, are also pretty slim.
Put that all together with the added requirement that this must all take place within a window of around 6 billion years (at the most), and it doesn't seem very likely at all.
That's not actually based on anything. You are embellishing supposition with speculation.