Well one aspect you and ninespine conveniently ignore is in that case it would be the original author creating the message/work.
With rings of power we have someone "adapting" the work and adding something not in the original in such a illogical/hamfisted manner. Like others have said if the Numenorean's had gotten mad at Halbrand since he actually took up blacksmithing/potentially took a job, I wouldn't have cared really. Yet they made it Galadriel/elves that are taking the jobs even though Galadriel literally gave no indication of taking a job(in fact she literally from the start wanted to leave Numenor). This anger at elves is being superimposed over the original message(elves are immortal/numenor is pissed about having a short lifespan) to try and keep the same outcome (Numenor mad at elves).
That is why it is an issue, that is why people have said it is a poor allegory.