This is it exactly.

And I kind of like that there are no total upvote/downvote stats tied to our accounts.

Prevents karma farming so it disinclines the behavior to rage-bait or post controversial items for attention.

(Remember u/unidan? Guy karma farmed hugely and eventually got rumbled creating some brouhaha over the difference between crows and jackdaws. Absolute stupidity that got the better of him..)

The content is more the focus here..