If they don't know what they want, explain the response to the Diablo presentation.
I'll take your refusal to answer the question as a concession. At least you tried. As for "other games use existing engines too" yeah no shit. And typically these games put effort into creating their own visual style. Diablo:I looks exactly like the game it's ripped from.
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yeah, total concession. Take a lap. 
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Feel free to answer it then if your stones have dropped in the meantime. You're not fooling anyone with your snark, saltyboi.pic.twitter.com/VWtcvHjIaD
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Is developing a game without a pre-existing engine more challenging than developing a game on top of a pre-existing engine? Challenging here is a subjective term determined by he developers on the project. More time consuming? Yes. Good enough answer?
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I think you know that your answer is (yet another) dodge. How difficult a task is can be quantified in man-hours and by that standard you have just conceded my point.
End of conversation
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