It’s actually culturally appropriate to eat sushi with your hands if you want, making the turn over dipping easier. The only reason they say not to dip the rice side is the worry that it’ll soak up too much soy sauce and the fish flavor will be overpowered. But it’s not that big a deal.
The passing food from one set of chopsticks to another is pretty strictly avoided in Japan though. They pass bones like that as part of funerary rites so it’s pretty closely wired into Japanese people as a cultural taboo.
It’s actually culturally appropriate to eat sushi with your hands if you want, making the turn over dipping easier. The only reason they say not to dip the rice side is the worry that it’ll soak up too much soy sauce and the fish flavor will be overpowered. But it’s not that big a deal.
The passing food from one set of chopsticks to another is pretty strictly avoided in Japan though. They pass bones like that as part of funerary rites so it’s pretty closely wired into Japanese people as a cultural taboo.