I wish more games were as mod-friendly as Bethesda's games - particularly single-player games. For example, Watch_Dogs. It would be great if developers were open to the community creating more content and tweaking the game. Bethesda goes above and beyond with this by even releasing developers tools to the community. It's kinda their thing in that, the PC version is practically built to be modded, but I don't see why any other developers couldn't be successful with this strategy.
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Because they need modders to fix and improve their games.