desynching helps you to constantly be able to put pressure on your opponenets and limits their options of what they can do. when i am desynched (which is really often for me probably more than any other ic player) my goal is to basically get your oppnent to shield so that when they do you can get in an easy grab adn then thats basically a stock. unfortunately, characters with good projectiles (pit, falco, rob) are able to render desynchs basicalyl useless in a match so watch out for that.
desynch ice blocks also lead to an ice block lock if an opponent misses a tech