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But in the book, almost everything happened that way. They added too many references to The Lord of the Rings; those who were supposed to die, did die; the secondary plotline was smoothly removed, and the Eye flew off into the sunset.

That's understandable, but since the previous installments decided to "mature," why did they leave it as a children's fairy tale here? Either they should have filmed it as a fairy tale from the beginning, or they should have lived up to the "declared" intention and surpassed The Return of the King. The trailer is more exciting and epic than the film itself.
By the way, if the dwarves had stayed in Erebor, none of the main characters would have died, and the result would have been the same. The eagles would have simply killed everyone. In general, you can just send the eagles into battle and not worry.