Long story short, I can't aim up or down if I'm strafing right or left at max stick movement, with the Legacy stick layout. That's the stick layout I've used for the last 20+ years. This happens regardless of controller or platform, I've tried on Xbox/PC/PS4 with various different controllers.
This doesn't happen with other games, except Halo, which was also created by Bungie. Don't think 343 even knows about this either. It is a *very* annoying problem that has caused me to quit playing for months at a time, and every time I've come back to play again, I leave because of this same problem. I don't want to play Witch Queen and have this same problem take all the fun out of it, again. There's a YouTube link describing and demonstrating the problem if you want a more detailed explanation of this.
https://youtu.be/RAMWAoq1HtE
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Of course anytime anyone posts about this, no one at Bungie ever sees it much less says anything about it. Explains why Legacy has been non-functional like this since Destiny 1 launched. Even Halo before that.. it's time to fix it.