Allegedly, one major reason is that Apple has been successfully pressured by Greenpeace to remove PVC from their cables, causing them to be more brittle and fail sooner. https://fee.org/articles/this-is-the-real-reason-your-iphone... is one source, but Apple and Greenpeace themselves tout this "achievement". It seems to me to be just like replacing nuclear power with coal and natural gas power: another casualty of ideological extremism at the expense of the actual environment.