Well, we're just disagreeing with the principle of perfect knowledge, we both agree that FTL is currently impossible. You don't believe in any such notion that perfect knowledge has paradigm shifts contained within it, where as I believe there's always the possibility once perfect knowledge is attained, which may not be in our lifetimes.

Its fine to stop dreaming, but scientists who want to push the boundaries of our understanding will be the ones doing all the dreaming and making the impossible a reality.