It's what "apostle" means For reasons best known to Himself God decided to delegate some stuff to human-type personnel. I wouldn't have done it, myself.
Also this is where you have to sort of pore through the catechism and lots of conciliar documents AND/OR read some "ordinals". Loosely speaking the Church tries to "discern" a "call", not issue one. The language is very much, "seeing if you have a call", not "deciding whether or not to ordain you." I suppose it's a matter of trust which one you think it actually is. And the gifts are given by God, just as God acts in every sacrament, according to His promise, we would say. The bishop doesn't make someone a priest, God uses a bishop to make someone a priest.
But where are we on the "class" issue? I don't want to get into another question if we haven't dealt with the prior one
By "class" I'm mostly referring to the supernatural powers claimed that set apart the clergy and hierarchy into a different class of Christian. This class has powers and authority that by definition are unavailable to the laity. I noted it as a difference in Catholicism because the laity are taught to obey the authority of the Church almost regardless of where the Church leads.