You would need all those possible hardware configurations in your datacenter or basement or wherever. If it's not done on real hardware it's just guesswork.
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I believe there are firms who will actually do it if you pay enough.
You would need a way to walk through a good chunk of realistic gameplay without user input. Good luck with that.
The closest thing to this right now is the performance monitoring that Valve does for Steam Deck compatibility — which isn’t headless, it’s just crowdsourced.
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