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Maybe I want to fly accurately modeled engines to fly say American or Singapore and not have to split my brain over flight planning. I doubt I'm the only one.

You can't "accurately model" something when even the default GE engine isn't accurately modeled. You don't even have the correct sounds with it, which is why I don't understand what a different variant with a different engine matters since you won't have sounds OR performance metrics associated with them... The only thing you will have is something that maybe looks slightly different, but it will have no effect whatsoever on how it sounds or flies, so what's the point of this other than additional revenue for CS?