Adagio
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You can even die during that time)))
You can spend 10 years developing a game and not achieve the desired effect, or you can abandon it after 4 years and create an excellent game. It all depends on the developers.
But it's not their fault, it's Ubisoft's fault. They should have understood that the company is small and not capable of handling huge developments.
They could have involved someone else, like Limbic, and then they might have succeeded.