The examples of coat tails was only an example of plastic innovation. I did not mean that the same principal would necessarily work, or that it should be adopted. The point, is that there are difficulties, in all plastic kits, but that they can be overcome. There will be a way of sorting your problem. With european armies, it isn't really a problem, as has already been stated, and is far easier to overcome uniform differences. In terms of the US, there will be a solution.
I agree that a badly done plastic would not be worth it. But just because it is hard, doesn't mean it can't be done, and when someone finds a solution, they will make a lot of money and make a lot of people very happy.
I don't know what the solution is, but there is always a way in such matters.
Even, if the way things were done, was that in the US, box, X number of troops had M1 Grand belts, and Y number of troops had other webbing, while the remainder had equipment for other roles, there would be many advantages to plastic.
Of course in this scenario, the ratios between X and Y would be worked out to correlate to the ratios of different armaments in the US army.
Again, I am not saying that this is the definite solution, but it can be done.