> Sometimes, there are chapters where the characters do nothing but think or walk around their house...etc. That would be really boring in a game

There are games that do that too. Usually short indie games but I've seen games do story-focused segments too. The best examples I can think of would be What remains of Edith Finch, Yume Nikki, and I've even seen games interrupt gameplay just for short breather section to build up story. Also keep in mind that Video games and Books are completely different mediums and you can, and have to make adjustments. Descriptions can be moved around, placed in certain areas, or you might have to remove them entirely and have to get the point across without the soliloquy, which is something movies have to do as well.