Prakriti
Hi, I'm a Mindflayer, but don't let that worry you
Giants were Large in 1E and Huge in 2E. So there is precedent for both.I don't really understand the move to making giants Huge size when in previous editions they weren't
That said, 5E's Huge Giants create interesting problems in Tales from the Yawning Portal. The maps for Against the Giants were designed with 1E's Large Giants in mind, which means that 5E's Huge Giants can't fit down their own hallways in some cases!