I would agree to a point that I am sure chrome tanning today is a little different than in 1942, and I would guess there are some chemical composition difference in the pigment used to finish them, which in reality is nothing more than paint.Hola Juanito!
Not disagreeing with you, but I think that part of the problem is that to replicate an A2 using the original processes that were used during the war would almost be too costly, and because of environmental laws regarding those original manufacturing processes, would prohibit any maker from using those techniques. At least that’s what I’ve understood as part of the problem .
That said, I do not think we are far off. The crazy thing is that of all the jackets I have had over the years, the horsehide leather and finish on the Avirex MacArthur was closer to the original nearly unworn Perry and another original A-2 a find of mine from college had from his dad that was essentially unworn.
It reminds me of the first Eastman I got in 1990 or 1991 as an "upgrade" from the Avirex jacket. While the quality and components of the Eastman were far better than the Avirex, I thought, "Now, if I could just get an Eastman jacket made of the Avirex horsehide, that would be a great jacket."