Oh yes, sure. But of course the entire switch created a lot of stress, uncertainty, anxiety and so on. It is impossible to measure the real costs of that switch

Oh yes, sure. But of course the entire switch created a lot of stress, uncertainty, anxiety and so on. It is impossible to measure the real costs of that switching. But I bet they were very high. Having a basis, where one supplier/resource never accounts for more than let's say 20% makes a system much more resilient. I think it is "just" simple math, that was ignored before because it was cheap and easy at the time.