While it may seem foolish to bother observing far away planets like this due to our lack of ability to reach them, one should remember that humanity has always had seemingly unobtainable goals that we have always dreamed of reaching. Despite the distant nature of our goals, things like this inspire us to expand our capabilities and strive to "reach for the stars".
Despite being mere fantasy for millennia, humanity has made amazing progress to reaching the goals of humanity which seem to be fundamental to human nature as they occur in stories from every culture and society: immortality, building an artificial person, traveling to alien lands. We have made progress toward these goals: our understanding of biology is improving, our technology has progressed to the point where AGI isn't an impossibility, and we've made it to the Moon and sent probes to the edge of our star system.
Humanity will not reach the new planets we find in our lifetimes (we're still working on Mars!) but unless humans are drastically altered or go extinct, we will continue to chip away at "the impossible" until we've actually managed to accomplished it.