content: The general argument is, "if the majority of people want to share something to a specific sub, why prevent others from seeing it?" To a point, I agree with not preventing it. All should be just that, all. But, also, I don't browse all because i only care about the subs I'm subscribed to. One can make the argument that by browsing all you may find a sub that you didn't know about and might enjoy. That's fine. But then the purpose of all has now shifted from "all posts made site-wide" to "discover new subs." And then, if one sub dominates that, you would be prevented from finding other subs without putting in the leg work.