The problem with most of these companies is a strict chain of command. Our Nvidia account manager is one of our closest friends in the industry, we've known him for over twenty years dating back to his days as the ABit country manager, but he's at least five people removed from the main decision makers and isn't briefed on everything. He can ask questions up the chain but there's no way to guarantee that he'll get a clear, honest answer.
The exact same issue exists for most of the Chinese/Taiwanese companies too. A political, need to know, approach is prevalent in those cultures. I wouldn't necessarily call it dishonest, it's a form of leak control. Ironically, I believe that most leaks come from the Chinese nearer to the top....
On top of this, I also believe that the inherent toxicity of online culture is driving even more privacy. If someone at MSI HQ for example, publicly said that they were shipping 1000 3080 this week. There'd be people saying that's not enough, people saying that it'll all end up with miners and people from pretty much every country demanding that their country would get the majority.
Generally, giving out information, especially relating to graphics cards right now, just triggers a backlash.