I've seen a lot of people complaining about how the map will be smaller than the Witcher 3's, but they don't seem to get that there will be a lot more actual content on that map.

The Witcher series is set in a fantasy-medieval world. It's not very dense or populated. There are small cities, but the biggest cities in the Witcher still have a fraction of the population Cyberpunk has in a single apartment building. Cyberpunk builds up, not out. So you won't have massive open fields all over the place, you'll have cramped city streets, tall buildings full of variety and things to do.

It's literally like comparing an downtown area of a huge city with some country hamlet. Sure, the country locale has a lot more open space... but there's nothing going on in that space.