Greg Farris writes:

That is demonstrably false!
There are several documented cases of mechanical failures of throttle
linkages in airplanes, and when it happens it is a genuine,
life-threatening emergency.

As I've said, failure modes are very limited for mechanical throttles,
and generally they are not catastrophic. A failure of a linkage, for
example, may deprive you of throttle control, but it is much less
likely to peg the throttle at idle or full power (although this
depends on design).

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