I don't think there is anything wrong with asking whether there are still any parts of areas that have never been discovered, for example.

It's probably a silly question since for 99.99% of players, the answer is absolutely, "Yes".

And if I recall correctly, there was a post (probably a couple years old now) where an Immortal suggested some percentage of Hell hadn't seen adventurers yet.

Either way, quit ragging on people for wondering, even if it is kind of a meaningless question to begin with.