As Katfish says, you don't have to have an engine failure to end up on one engine: engine chip, false fire warning, loss of oil pressure, are all events I've seen in the recent past.
My highlighting the words "engine chip".
How many Engine Chip lights preceded an actual engine failure?
If Brother Lappos thinks we worry about a mere 5%.....I would submit that worrying about an Engine Chip Light being any kind of warning that requires any sort of
immediate action beyond re-setting the Master Caution Light then monitoring some instruments and listening for abnormalities..... is really over the top.
I guess some folks whistle as they walk by a cemetery at night too thinking that helps keep the Haints away.