Importantly, there is research from scientists finding that cursive learning is a way for cognitive development, especially in training the brain to learn "functional specialization"; that is, capacity for optimal efficiency. Regarding learning to cursive writing, the brain develops functional specialization that combines sensation, movement control, and thought. Brain imaging studies show that some areas of the brain become co-active during the learning of pseudo letter writing, as well as typing or just visual practice.
Cursive writing helps train the brain to integrate visual, tactile information and fine motor dexterity.
The benefits for developing the brain are the same as what you get by learning to play a musical instrument. Not everyone can be good at music, but everyone has access to pencils and paper. Not everyone can buy a computer for their children, but maybe those kids don't lack it as we thought.