[p_l]

There are requirements for performance - appropriate to the function.

The electronic flight bag interface is not used in emergencies, one of its main uses is in planning and submitting flight plans before takeoff, and it's generally not used for actively flying the plane.

[7952]

Exactly. In an emergency the last thing the pilot wants to do is navigate a map interface for anything. Better to just select the alternate flight plan that was setup hours ago during flight planning.