It makes perfect sense. Why would anyone get excited about another galaxy that they can't explore even 99.999999999999999% of the first one? What would be the point? What distinguishes it from the first one?

It's even less impressive if you have a basic understanding of how procedural generated content works. Unless the variables making up the first galaxy have been expanded or differentiated in some way from the first, the second galaxy will be indistinguishable for all intents and purposes from the first. In fact, given that the second galaxy is just a seed swap, and exploring new planets is basically just rolling random stats in various categories to generate planets in the first place, there isn't ANY difference between the first and second for any practical sense at all besides its name.

It would be like getting excited about reaching a point in a minecraft map, and your reward is just a new map with a different seed...when conceivably, if you just wandered in a random direction for long enough you would probably see the same thing on the first map, or something close enough to it that it wouldn't be a difference you could tell or care about.