Adding client side validations offloads some work from your servers. It could reduce the number of total requests that hit your server and overall increase you

Adding client side validations offloads some work from your servers. It could reduce the number of total requests that hit your server and overall increase your speed. This may be premature optimization for a lot of cases but for form heavy apps this could be a useful optimization. Also saving a round trip to the server can make the UX seem snappier and overall give a better user experience.