Why are multiple engines different?

Dale writes:

Perhaps it's because if you screw the pooch on those "few procedures for
the failure of an engine" you will be dead.

But a lot of procedures can result in death if they are improperly
executed. It's not clear to me what the key distinction of multiple
engines might be that would justify a separate certificate.

Some of those procedures are pretty much guaranteed to result in death
for a single-engine plane, so anything one can do with multiple
engines would be an improvement.

The only thing that would keep you from getting your initial certificate
in a multi would be money. (insurance and the nerve of your CFI may
factor into this also)

So someone will do it if you put the money down?

Would learning and getting a license for a multiengine aircraft also
implicitly allow one to fly single-engine aircraft?

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