Guys like
@PT Car Washer and
@Commercial Inside Release don't want to hear this, because they relish their perch on the fence and refuse to follow the prescribed contractual path.
@PT Car Washer claims to be 60+years old and a 30+ year part-time employee, while fussing about progressions and his perception of a multi-tiered pay scale.
Reality is that he could have went full-time long ago and when the progression was at the most half of what it is now and decades before 22.4's were conceived.
They only continue to make this noise in hopes that their coworkers don't get wise and put an end to their extra contractual arrangements.
There is nothing they can say to validate delivering, picking up or shuttling ground packages.