I personally think uncut is better as it looks more natural, and is probably better for bees and other insects. The flowers and other weeds that grow make it look nicer as well.
I don’t think cutting a lawn is that bad as long as its not done too often, though.
edit: grass. This is a post about grass.
Edit: Lawns, like the grass in your lawn, jesus christ.
Well, my mind is in the gutter I guess. Yards, I like a balance. Wild in defined spaces; food garden without weeds; open yard is literally mowed weeds, not too short. Flower garden has some weeds. We get lots of bees and butterflies with this scheme.
(On the question I thought you were asking, slight preference for uncut)