Interstellar flight is an insane challenge. It’s one of the hardest things humankind can attempt yet still not beyond the laws of physics. That means you have to approach things from first principles and often have to invert the problem (“assume we manage interstellar flight by 2075. How did we do it?”, etc). It’s intellectually seductive in the best way.

I think it’s good to attempt such challenges, even if just conceptually, as it makes lots of other things seem a lot more achievable in contrast, sometimes almost laughably so.