OP...since an engineer (hope in the hardware side)...you should understand 'duty cycle rating'
Yes, over loading just a few hundred won't have the wheels instantly fall off...but
they will sooner than if under the rating
One of my first mentors while still in college taught me much...two that apply
here....
#1 Design it for the idiot and gorilla, as if they can mis-use it and/or break it...they will
#2 Design it to the specification and beyond to the company specified margins
Should add that all things designed/engineered are NOT for the good days out there,
but for the day Mr Murphy crossed your path. Either your spec plus margin is
enough or not
That is where the fine print of all ratings and specifications kicks in...they
are modifiers to the specification numbers...AKA CYA legalese, weasel words...