thats not improving lag...its just change the throttle curve..

electronic throttle control should be as fast as mechanical linkage..
yes, there a delay, for sure...but at certain point it almost undetectable...

take servo used in RC car as an example...the high speed servo follows your hands movement rapidly..you mesmerise just by looking at it...

maybe theres a time where manufacturer will invest in zero-lag throttle control to cope with market demand...

BTW, electronic steering doesnt have lag...its just lack of feel/weight....