As flight path states, those gradients are for all-engines operating only. With all engines operating you have to determine whether your aircraft can comply with the steeper climb gradient. If not, you are required to use the higher minimums predicated on the less demanding climb gradient.
With an engine inoperative you need to have a one-engine inoperative "escape route."
As to normal ops, no one provides the performance data so it is mostly an exercise in politics rather than performance.
A lesson in aircraft instrument flying procedures: It is a lot easier for the government lackies and manufacturers to determine how an airplane will descend on an instrument flight procedure than climb on an instrument flight procedure.