Well, there's the case for other platforms than PC. Also, maybe if you are a major studio who will with certainty release your game within 18 months, perhaps y

Well, there's the case for other platforms than PC. Also, maybe if you are a major studio who will with certainty release your game within 18 months, perhaps you should. But if you invest heavily and lock yourself to a specific SDK of a single vendor, you better hope the SDK survives and remains relevant.