Also if Netflix or Twitter decide to require device authentication they can give you an error message and instruct you how to turn the holdback feature off
That’s a silly proposal that will eventually be turned off as it causes issues. Users will complain that sometime websites are broken for no reason and the first proposed fix would be to turn the failure probability to zero. Then the zero failure setting will become the default.
I use it sometimes to turn a notebook into a presentation and it doesn’t work with Jupyter Labs