I think this means well, but is highly flawed.
The engine? Just not a perfect system.
Wear and tear, electrical system health? Are all cylinders firing? Every cylinder getting the same intake charge? No valve springs affecting exhaust or intake?
Will every single FW190 of each type provide the identical performance of every other same type?
And what about weather, ie air density or temperature.
You are demanding a digital reproduction of a very analogue system.
Which is tiresomely representative of all those that complain ceaselessly about their favourite aircraft.
What about engine manufacturing quality 70 years ago?
What about fuel quality 70 years ago, amidst resource denial?
What about every little thing that affects the performance of an aircraft that CANNOT be precisely captured with mathematics?
Just have a look at modern racing. With all the tech and knowhow and experience available now, why do teams bother trying to improve their vehicles?
Isnt it simply a case of using exactly the same settings for every race track every time you go there?
Useless.