Mods that build upon a video game's foundation or change the fundamentals of how it works have been around since the 1980s, and have only become more common as popularity and support for modding continues to grow. There are many video games like The Elder Scrolls V: Skyrim and Left 4 Dead 2 that, while good on their own, are best played with mods to either add new content or overhaul clunky systems.
Source：https://www.cbr.com/video-games-that-are-great-without-mods/
