Hands up those who have had engine failures? ----- seems to be a few.
Hands up those who have had an alternator failure in flight ---- more hands now.
Hands up those who have had a vacuum pump failure in flight? --- lots of hands now.
That's why I prefer a twin. Try an alternator failure in cloud & rain at night midway to Woomera from Port Augusta in a single. There are more things than engine failures that can get you.