I don't understand how this game is possible. I simply don't. I'm over 50 hours into the game, and the more I play, the more flabbergasted I get. RPGs like this just don't get made anymore. Sometime in the last decade, it just stopped happening.
I fucking loved Fallout New Vegas, but it was still the sort of game I expected to get made because it followed the formula of what people expected from content in modern RPGs. Obsidian's writing and quest design is really good, and they really made many of the areas memorable, but it was still very modular in design, with a good amount of geographical filler to create this illusion of a large world without having to double down or triple down on density to make a game feel really, really rich in content.
Here it's the complete opposite. Instead of having any filler areas at all, it's an insanely densely populated game where every screen and every area feels designed and packed to deliver maximum impact on the overall game. There's always something interesting in any given area, there's always a a bunch of quests in a region, stories connect and intersect in interesting ways, the world feels tightly connected, and every play session has something which makes the player go "oh!" or "ah!" when finding something new adds to the on-going narrative threads, or getting a new item or skill brings something fun to the table, or just finding an area you've been hearing about for some time from other characters.
It's really unbelievable how a game like this gets made in 2014. Comparing Divinity OS to pretty much every CRPG made in the past decade would probably be like comparing FFXII with every JRPG made in the past decade.