Checking my understanding of "branch in parallel current" warning
Because of the variation in contact resistance between mated pin/socket sets, two sets in parallel carrying twice the current meant for one will divide the current in inverse proportion to their resistances, with the higher resistance set shedding current the low resistance one must carry.

For example, with a 20 ampere source feeding a 10 milliohm resistance in parallel with a 20  milliohm resistance, 1/3 of the current (6.7 amperes) will flow through the higher resistance, while the remaining 13.3 amperes will flow through the lower resistance, exceeding the 10 ampere current rating of the low-resistance contact set.