Throttle response is something that is missing from AH, as well as adjusting mixture and other engine controls. But too many people would complain if it took 5 seconds of adjusting controls to engage WEP in an La-7, while LW pilots would barely lift a finger. I'm no engineer, but Spitfires and P-51s (to name two) would certainly suffer compared to 109's and 190's with the introduction of more accurate engine models.