It's probably fairly easy (in relative terms of course) to make a cloud simulator that looks accurate, it'll be making it use a limited amount of resources and run acceptably while the computer is simulating everything else needed that becomes an issue I'd imagine.
I'm sure Oleg could give us an almost completely authentic sim with absolutely everything modelled to within a few % of reality if he wanted, but he'd need either a massive team of staff or many many more years to do it, concessions have to be made at some point.
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