Another advantage of the dual servo solution: redundancy.

With DEPS, every component that can fail can bring the airplane down: servo, cf rod, cf rod end, servo clevis, servo - receiver plug, receiver port, servo wire, ...

I know that many of those components are very reliable, but from a design point of view this system is LESS reliable than dual servo.

Now let's analyze the dual servo approach. Here all is replicated: two servos, two receiver plugs, two wires, two links, two clevis...

And if either one fails, the other one is enough to safely land the plane - I can witness that, I've seen exactly that situation happening

The bigger disadvantage I see of the dual servo solution could be the weight in the tail.