Or maybe it actually does enrich the conversation by providing an alternative point of view to consider, unless you expect everyone to take your equally speculative claim that "this was good for Amazon, not for customers or writers or the industry" as the factual truth when there is no such factual basis presented.
Apple was unwilling to compete on price. It's fine with me, but the alternative is not to fix the price so that you cannot get a cheaper deal from competitors, the alternative is to offer better value and let the consumers decide whether they value your offer enough to justify the higher price tag.
Furthermore, I don't see how Apple "brought a better product" when the vast majority of ebooks were basically the same, Apple's ebooks were and still are not available on any epaper ebook reader and iBooks being worse or better than e.g. the Kindle App is pretty debatable.
Learned what? A very big part of this "high competition" you praise is price, which is exactly what Apple sought to remove from the equation in the ebooks market by enforcing the same price everywhere. Following your reasoning, you should actually "thank goodness" the Apple deal was declared illegal since competitiveness apparently works much better without fixed prices (which should be obvious...).
Furthermore, under the model from Apple there was no such thing as higher margins except for Apple itself. Publishers and writers were earning more under the wholesale model from Amazon. This was confirmed by the publishers themselves as far as I remember. The whole deal was not an attempt of the publishers to earn more money, it was an attempt to keep the perceived value of books artificially high even if it actually meant lower revenues from ebooks.
As a side note, Spotify is accusing Apple of anticompetitive behavior, with an ongoing FTC investigation and a complaint filed to the EU antitrust commission, so at least one of the key actors of the eco-system feels Apple is misbehaving in the music industry too.