Originally Posted by Oracle

You could say the same about sand though. There's ~7 quintillion grains of sand on the surface of the planet to be discovered, geologists even say they don't know what's all out there.

Point being, 7 quintillion grains of sand, but how many are going to be so close to identical that it's not even worth mentioning? Same with planets. You could procedurally generate 100 planets, then just copy pasta them into 17 quintillion planets, and you still wouldn't know what's all out there.

Large scope of content doesn't equate large depth of content. I find it hard to assume, or even expect, that even the vast majority of the 17 quintillion planets will be worth exploring in relation to each other.