Re: "two main reasons why the Royal Navy no longer uses [paper charts]"
When they say " everything", they mean all primary and backup methods of navigation, of which there are several, including using paper charts.
Using paper charts as the primary full operational navigation capability in all conditions is the thing that isn't done anymore.
And if you do ever lose "everything", you'll still know where you were when that happened and the ship won't instantaneously jump somewhere without you knowing it. Also, there comes a point where knowing where you are becomes a lower priority to certain other things, depending on where you are what your are doing at the time.
Biting the hand that feeds IT
