And yet, simple standard emergencies are of no special use except in initial training.
It is interesting to note how multiple emergencies in the sim are considered abusive, whereas realistic emergencies should incorporate startle effect and confusing alarms like in some real life (and death) situations.
A "simple, standard" emergency is more likely than a bells and whistles disaster, so of course it's still useful to train them.
There's a place for unscripted scenarios; that's what ATQP and LOE details are for.