FWIW, I've personally encountered 2X HCH3 inverter failures. Real b!tch too. They are VIN coded, so no aftermarket or salvage yard option. At least with the Prius, you have a cheap option.
Prius inverter passes over 3X the power of the insight inverter. Cable run length has little to do with it due to the low AVERAGE current (about 20A).
The 2010-2014 failure rate is probably less than the 06-08 HCH2 battery failure rate (1 in 6). I've serviced or consulted on 23 2010-2015 Prius issues, and none have been inverter related. I'm only aware of one via a shop I collaborate with. WAY more issues with head gaskets and dead batteries.
This crap gets blown out of proportion.
171,500 vehicle fires occur every year
. That's more than the number of Prii sold in the U.S. each year, 2010-2014. Where's the outrage? WE SHOULD BAN GASOLINE!