If you do more than just jiujitsu, meaning takedowns, kickboxing, any of it.. You need a cup. Barncat and I have an agreement at 10th planet Beaumont, if someone shows up without a cup, he's repping knee slice passes in jiujitsu and inside leg kicks in my kickboxing class! Lol. It's protective equipment. You may no like it, but its there for a reason.. Plus it's our gym rules.. Don't like it? There's a Gracie barra down the street..
I see your cup and mouthpiece like I see a seatbelt. 99.99% of the time you don't need it. But that 0.01% spit second you do need it, it's the most important thing in the world at that moment. I wear my seatbelt.. Just sayin.