Well, to be honest, if you want to have a high level discussion about any subject related to computer science, coding, new technology, etc you must be able to speak English, because all high level discussion happen in English. As the best discussions are in English, it is natural that most merits will flow to the global forum.
Frankly speaking, I fundamentally disagree with you, since I have repeatedly come across interesting technical threads in local sections that have not been duplicated or previously featured in the global section. Here's one example ...
storing a backup copy of the seed-phrase in the bitcoin blockchain. I may not be as advanced as some of the people who always write in the "Bitcoin Technical Support" section, but if I had seen something like this before, I would have noticed.