Having actually asked this question of Steve Jobs at a town hall for interns (& having worked at Apple later as a full time employee) and it is 100% in the DNA of Apple to try to make things intuitive without needing to reference a manual. There's a reason they don't include anything more than a getting started guide. That a manual exists and is high quality isn't proof that they intend or even expect the typical user to use it. A lot of it could also be for SEO purposes so that if you're searching for a question the top hit could be directly from the manual rather than a random blog post.

I have a feeling they also rely on less tech savy users buying in-person at the Apple Store where their sales staff can do whatever custom 1:1 training is required.