If anyone gets CA ADD and needs an additional explanation, here is an extra one to add: almost none of envoy's flight plans plan for a correct top of descent based on published arrivals. Be sure to add this to your list of reasons why you need the fuel, since sabre doesn't calculate TOD based on published STAR altitudes.

This is insanity. Considering it is the Captain who must agree to accept the fuel planning, NOT calling for add fuel when you believe you need it is non-compliant, according to the FARs.