Don’t believe the old trope of throwing water at robots short circuits them.
Wire insulation, liquid tight casings for boards, sealants; most with processes I don’t know how they work.
As for Genji we won’t know. The best source for how bad his body was damaged is up to your imagination. Because you yourself will come up with how devastating Hanzo’s Assault against his own brother was. If you knew exactly how bad Genji’s injuries are you lower their severity.
It’s like hearing horror stories on how bad a prisoner committed a crime. No one knows and that makes it scary. If you found out all that prisoner did was punch a police officer it’s not that scary. Yeah the prisoner has no fear but if you don’t know why they are there for; your imagination can make the prisoner’s reason for being there more intimidating.