The point is for the player to test their own hardware and for the devs to get a read on how many of their current players will be able to continue playing their game once upgrades kick in. Sure, players can share scores and so on, but those sorts of scores are never intended to be a competition because all it'd be is to see who has the most money to spend on a gaming computer. Nothing more.
Actually, this sends the wrong message for the game, that you need a computer worth a college degree just to play the game. Of course it doesn't, but potential customers who would glance over those leaderboards probably wouldn't be aware of that fact. If anything, that's something that would give those potential new players one more reason to pause for thought.
