I know most of the Bethesda RPGs have massive mod support, and there's games like Minecraft that have more mods than anyone can imagine. I would consider those games pretty playable in their vanilla states. Would you say there are any games that were "saved" by modding? Or that are still kept alive by thriving modding communities? What are some of your favorite mods?
Definitely RimWorld. There's so many mods that improve the base game. From QoL mods that make you wonder why that isn't default in the vanilla game, to mods that complety overhaul the actual win condition. Just overall a really fun, replayability, frustrating game.
Use mods though. It'll make it better. Check out p-music mod while you're at it.