1) They did create their own engine, called Cobra.
2) The "I dont know" answer isnt from a dev.
3) They dont have to constantly communicate everything with us, because in the past it clearly showed people here go ape when they misunderstand something or when plans change.
This has worked so well for them so far, this lack of communication instead of preventing what you have described, has instead contributed to it to a large extent. So the absence of proper explanations cannot be explained away with such platitudes.
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