Just a thought, where would you stand if you stacked a PA28 in a 30kt x-wind in and aircraft demonstrated up to 17kts insurance wise? Would you still be covered?
God forbid, if anyone got injured how would you stand against being sued?
I'm sure it has more to do with rudder authority than the highly experianced test pilot could't be ar*ed to find a stronger x-wind than 17kts.
We all know best hey, who needs the POH anyway!