I never understand why engine failures are almost always simulated after take off or in the cruise.
Because a power failure after takeoff when heaviest, lowest, and carrying the most power at the highest angle of attack...is the single most critical time during the course of the flight to lose an engine. That's why we train for that scenario, because we train for the worst-case scenario.
In some respects one of the most dangerous failure modes is an engine failure in the descent in IMC, particularly if and when power is needed to arrest the descent.
Far, far less critical than an engine failure during takeoff. If you can't arrest a descent, then one will continue to descend...one has altitude, one has a descent going...one is far better off than when one has no altitude to play with during the takeoff. Descent is far from the most dangerous time to lose a powerplant.