Thorondor (at that time called Thorndor), and the other eagles have a prominent part in The Fall of Gondolin - one of JRRT's earliest Middle Earth writings. Thorondor was also stated to have been a vistitor to the Halls of Manwe in the Lost Tales. So, I think it somewhat doubtful that Tolkien ever changed his opinion of Eagles.
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"If you would be a real seeker after truth, you must at least once in your life doubt, as far as possible, all things." -- René Descartes
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