110V is annoying to work with because it has so many restrictions. It's no safer than 230V and coupled with more lax wiring regulations you have a much higher rate of electrocutions in the USA than in the EU.
Correlation =/= causation. The higher electrocution rate is probably just because Americans are stupider than Europeans....
More seriously, I imagine electrocutions have fallen greatly with the mandating of GFCI outlets in bathrooms and kitchens, with the problem being that only new construction has these unless someone has gone to the trouble of retrofitting them in older homes. Perhaps in the EU they were more aggressive about getting these upgraded. In the US, it's basically impossible to force people to upgrade anything; you can probably still legally use knob-and-tube wiring if that's what your house came with.
It's also substantially more labour cost to install, test and maintain.
I don't know about your house, but I've never, ever, ever had to do "maintenance" on house wiring. It usually stays in there for decades without being touched.
FWIW, the wiring in your "high power" circuits is much heavier than is used in most european circuits
Yes, but not only that, it's usually aluminum wire.