Gloves for scuba diving have two important roles. First, they insulateyour hands from the cold. Second, and in many cases more important is that they protect your hands while you are underwater.
Look at how these gloves nowadays are glued and stitched. Some are glued multiple times and are blind stitched so they ‘fit like a glove’! This improves the comfort when you wear them as there’s less rubbing and chaffing. They also keep your fingers and hands warmer with thinner Neoprene.