As has been said, less horn means lighter tips. Also you can make the cross section of the limb tip into a triangle, with the bow’s back being one of the triangular sides, and a ridge running down the belly. That way, you still have the original thickness of the limb tip back-to-belly, but lose a little wood from the sides where it shouldn’t make much difference to bending resistance. Eventually you will run up against lateral stability though.
Cheers, Bob