Dangerous: yes - potentially deadly.
Yes, true.
And why risk it? A properly wired neutral switching transfer switch is easy peasy.
The people claiming this is dangerous and deadly thusfar have not provided anything to substantiate that claim. It is not deadly. It is not dangerous.
Because that requires you to install a sub-panel and move individual loads to it. IF that is practical, great. I would agree it is the most perfectionist way to do it. But it is often NOT practical. Not everyone has the luxury of the physical space and design consideration requirements for a sub-panel. I for example do not, and cannot do such an install. It's a finished basement, in a corner, with multiple things in the way. Using a UL Listed properly installed generator inlet and interlock like millions of people do is safe and sane. Not connecting the generator (truck) ground to the house ground is an operational requirement, which in no way impacts or negates existing safety protections. None. You know this. The house is protected in the same manner it always has been. And the generator (truck) and cable are protected by the truck's GFCI.
It absolutely is dangerous and potentially deadly. The why has been explained MANY times here on this forum. @chl has drawn it out more than once. The short answer is that you potentially become part of the current path in the event of the right failure. The GFCI MIGHT keep it from killing you, but are you going to risk your life depending on the GFCI? The electrical code is there for a reason.
