No thread is specifically about any one topic. They often branch off to other things on people's minds. You can stop following the thread if it's not of interest to you.
That's his opinion that it is being derailed. If some contributors want to link the starting topic to perceived commitment and priority on the part of Apple, then they think it is appropriate and relevant to do so.
Now if people started posting their favorite apple pie recipes, that would be different.
I just bought the 'pink one' (Hibiscus). And I'm glad not to be encumbered by ridiculous feminine or masculine 'rules' about what's acceptable – which some still seem bound to.