Originally Posted by
InSoMnIaC
both designs will runaway if both [electrical] switches are stuck in the same position.
Right, and the point of the dual rocker design is that this is practically impossible.
On the dual rocker switch design, you need to grab and hold the trim wheel and disengage the pitch trim manually via the guarded switches.
The presence or absence of a physical trim wheel has nothing to do with dual vs single rocker. There are dual rockers with and without a wheel, and single rockers with and without a wheel.
Both designs have been proven to work. Both designs have protections against pitch trim runaway
Recent years had multiple high profile crashes with hundreds of deaths where the "grab the trim wheel" philosophy failed.