I think it's more of a mileage, communication and tooling thing. It took Anovos forever to get the Chinese to even come close on many parts of the armor. The Chinese are constantly looking for shortcuts. Many parts were changed without consulting Anovos and then there is the communication gap. Anovos probably clocked 2 or 300,000 miles flying back and forth to China. I wasn't personally involved but I did pick this info up from conversations with them. Disney has a process for approval just like any company. I don't think they would care all that much if it was too accurate. There are many props that are licensed now that are spot on in my opinion.
Sounds like there is a lower amount of butadiene in the Anovos ABS. Less butadiene will give greater detail and make the armor increasingly brittle like styrene. Increased butadiene will give the armor resilience but less ability to draw into the the bucks and hold shape. Also keep in mind that this stuff is made in batches. The next batch of armor they do may have totally different ABS. Different color, different composition...
Regarding MTK specifically, what do you think needs to change?
All this being said. You cant mass produce stormtrooper armor. It's impossible. Too many details have to be messed with so that the manufacturing process can be easy. So there will never be any company that can replicate the detail that fan made armorers can. The companies want to make money. The armorers want to make armor.