If we think of native speakers as athletes, it's clear that it's so difficult for non-native speakers to compete with them.
@snailboat Ah, don't worry. I wasn't writing anything long in the first place. :D
However, some of non-native speakers can gather more knowledge, more information, more techniques. Those in this group who chose to be teachers will propagate what they have to the next generations.
It may or may not turn out to be true, but the performance of some generation of non-native speakers in the future may not be very far behind.