[Pewpewarrows]

As any gamer in the last 15 years will tell you: the Windows key is the bane of our existence. It's a classic case of know your audience and customer, because if you've ever played a video game on Windows and are now developing one, you know that you should be disabling that key.

You mentioned expected behavior, which is good to abide by. But there's also preventing accidents. Your users are imperfect. It's the reason big red buttons also get a follow-up confirmation dialog.

Now, I'd definitely like to have a conversation about whether there should be a setting for disabling that override. But as for the default: it's pretty straightforward. When playing a fullscreen video game, the number of accidental occurrences of that button press far outweigh the number of intended uses. Pick your battles.