Plenty of ships have run aground using paper charts.
There is nothing inherently imprudent about using electronic without paper back-up if it results in fewer groundings. It’s a matter of which system is more robust and reliable in practice. Any system can be beat by the dumb and lazy.
Paper charts are no more “real” then electronic ones are. The cognitive resources of the bridge team is a limited resource. Reducing the work required to maintain situational awareness may offset the hazards created by the inevitable glitches the system may have.
K.C.