Mfers in this thread unironically believe that the Straw Hats 20 years into the story are ever in real danger of dying horrific deaths, and should die. Pretending that the series doesn't spoil Luffy winning the day at the end of it within Chapter 1.
Mfers its a fun adventure about the future pirate king, and we're a few arcs away from him just being the current Pirate King. You are kidding yourself if you still buy "OH DAMN SATURNS GONNA KILL LUFFY!11!!" at this point. Having a laughing power up fits this series tone more than a stone faced Luffy clad in full Haki. He doesn't *like* being deadfaced serious, and now he can fight in his truest form. A happy go lucky goofball who likes fighting for those he cares about.
Kaido liked being a power scaler, Big Moms whole kit is centered around ordering her homies around, Akainu likes to erupt like a volcano, and the cool Aokiji freezes people. Why can't the smiling and laughing Luffy smile and laugh at the peak of his power?
Roger laughs while he fights, why can't Luffy? He's not a fucking hero he's a goddamn motherfucking pirate who has literal murderers on his crew.