the issue does not relate to damage or safety
This is a great conversation and I know I'm taking it to the limit. I am sorry if I sound over-zealous, but in some applications, "a servo might not work" is indeed an issue of damage and safety. That's my point about engineering limits.
If your security camera unexpectedly stops panning, or your Halloween skeleton jaw stops waggling, you just drag it all back into the basement to tinker on it some more.
A model airplane or helicopter may work perfectly on the bench, but not when faced with higher torque under aerodynamic loads, due to limited power available. An airframe with marginal control is dangerous to property, bystanders and the pilot.