Yeah, not understanding that is a consequence of people not reading the source material, because Tolkien definitely explains exactly why the eagles couldn’t do that.
On the other hand, I think it’s a valid criticism of the movies that, for all the amazing things he did in that trilogy, Peter Jackson failed to explain something minor that turned out to be a lingering issue for some segment of the wider audience that would consume that adaptation.
I dunno, Mozilla developers have had 10 releases in the past 4 months alone, with many bug fixes in every release, and 3 of those releases being minor versions each containing multiple new features. I certainly consider bug fixes and new features to be improvements happening to the browser.