For the purposes of Silm Film (and I think a point worth making outside of Silm Film), we are treating Harad as a large and complicated landscape - it is by no means monolithic nor homogeneous. So, yes, there are no doubt portions of Harad and kingdoms within Harad which have remained loyal to Sauron in his absence. But keep in mind that at least some of that absence was a true absence. When Isildur cut the Ring from Sauron's finger at the Last Alliance, Sauron was lost and presumed dead for many years -- not simply by Gondor, but no doubt by the Haradrim as well. He was reduced to a shadow and could not embody himself. His followers may no doubt have kept up his cult in his absence, but it was not simply a matter of him orchestrating from afar.
We are focusing on one city-state. It is a coastal city, presumably a port and trading hub, with Numenorean origins back in the Second Age. We have decided that this particular city-state values its independence, and treats the cult of Sauron as an ancestral reality that has fallen by the wayside long ago in their history. So, this particular city-state is one that was 'lost' to Sauron post-Last Alliance. He will need to send emissaries to re-establish the connection, and he will have to work to corrupt the people to the point where they will be willing to join with him. As to where this city is located - it is on the coast, and Gandalf reaches it via ship. It is not technically more difficult for this city to be in Far Harad than Near Harad.
As always, there is certainly more than one direction our stories can go in. We make decisions based on the ideas that are brought to the table during a discussion. Sometimes, there are points we don't consider or that are not raised at all. No one is suggesting that the decisions of Silm Film are the only possible decisions, nor even the best possible - we are saying that, given everything, that was the decision we arrived at and thought was best for the story.
We are focusing on one city-state. It is a coastal city, presumably a port and trading hub, with Numenorean origins back in the Second Age. We have decided that this particular city-state values its independence, and treats the cult of Sauron as an ancestral reality that has fallen by the wayside long ago in their history. So, this particular city-state is one that was 'lost' to Sauron post-Last Alliance. He will need to send emissaries to re-establish the connection, and he will have to work to corrupt the people to the point where they will be willing to join with him. As to where this city is located - it is on the coast, and Gandalf reaches it via ship. It is not technically more difficult for this city to be in Far Harad than Near Harad.
As always, there is certainly more than one direction our stories can go in. We make decisions based on the ideas that are brought to the table during a discussion. Sometimes, there are points we don't consider or that are not raised at all. No one is suggesting that the decisions of Silm Film are the only possible decisions, nor even the best possible - we are saying that, given everything, that was the decision we arrived at and thought was best for the story.