People who care about the lore and source material are insignificant compared to the amount of people who just enjoy a lavish production in a medieval fantasy setting.
Clearly Amazon is targeting the people who enjoyed the movies and want a similar experience in a TV show format. Most don’t really care that it conforms to what Tolkien wrote. Heck, I’m probably unusual compared to the average watcher in that I have actually read LotR and the Silmarillion as a teenager and I don’t care about fidelity to the source material.