Stands work more on "how" the user thinks it works because it's all absurd magic anyway. That's why Rohan could just figure out how to manifest his stand when he couldn't before, why Mista's Sex Pistols need to eat when no other stand has to, and why Scary Monster's dinosaurs aren't accurate to how we know they look.

Giogio can make a giant suitcase into a tiny frog. One stand can freeze people to near absolute zero. Another ages and deages people. Stand logic doesn't make sense