The firearm industry is greatly resistant to change. It has its own corporate structure, the guys at the top do not understand their customers, and they just duplicate previous practice. Corporate executives dislike change, what they want is a guaranteed profit level, no conflict, and no competition. Rocking the boat will get you fired! Take a look at the movie industry as an example. If a movie is a hit, there are up to, five follow on versions.
My major complaint is the 1:38 twist rate on 44 Magnum rifles. It is too slow for bullets greater than 240 grain. However, because that is what was done, it becomes what will be.
The culture of the customer base does not help. There are entire forums where the posters have made a religion of "mil spec". Specially, the M14 rifle forums. I have asked makers why they don't make their receivers from an improved steel over the 8620 that the military used. The reason is, the customer base wants Mil Spec. I also asked an action maker, who was making modern versions of 19th century BP rifles, why he was using 8620 and not something like 4140 or 4340. His customers wanted a case coloring finish and they could not get that with 4140. To the customer, a metallurgically inferior steel is better because it has a pretty surface finish.
Well, I used to carry mechanical watches because I liked the ticking noise, so no one is perfect.