There are a lot of other "safety features" not mentioned so far in a twin - eg:
Dual suction/vacuum pumps
Dual Alternators
Multiple fuel "routes" (crossfeed etc.)
You do not have to have an engine failure to have a problem.
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Heavy IMC, cold, above freezing level.
Vacuum pump goes in a single. Uh-oh.... Hope my partial panel skills are current.
Twin: smile - you have another one still sucking merrily (!!)
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Same wx, this time the (only) alternator goes in your single.
Yikes - better land PDQ before my de-ice stops, I have no idea where I am, and I cannot talk to anybody on the ground.
Twin: no problem - you have two alternators and you know the load one-out will allow.
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Apples and oranges - simple comparisons reveal only half a story.