False analogy. There is obviously a huge between the vehicles produced 100 years ago and the current models. While the difference in bullet performance when comparing a BC of .4 and a BC of .57 at normal hunting ranges is imperceptible. At longer ranges, yes it would be a step forward.

Please explain why I should invest money in a new rifle or new fast twist barrel on an existing rifle when it would have absolutely no impact on performance in my deer hunting?

Gee, my new Corvette will leave my ‘56 keep in the dust on the freeway. But would not be an improvement over the jeep driving on the ranch.