Forum:Returning after a long hiatus, how crucial are syncrho monsters in competitive play?

I recently started playing again, bought a bunch of packs, and have built a few decent decks. My only deck where synchros ar important only has three, and yet I see sample decks on here with twelve or more. Right now I only play with my friends and do pretty well, but If I was to do any sort of tournament (there actually is a tournament around here), would I really need to go find a bunch of synchros?