Daggerfall was like this, if I’m not mistaken (I got into TES with Morrowind, and I’ve never found the time to play the older games).
The map was about the size of Great Britain, and mostly empty, even if it had about fifteen thousand locations spread about it.
They mean gamers of old. That is, currently old gamers, but back when we were young, and had time, and not a lot of games to fill it with, so we appreciated a longer game.
Current young gamers have vast libraries of games to choose from, and shortened attention spans due to social media.