I didn't say that sub-par experience was a
requirement, I said it was often a part of luxury products. Or, more precisely, I should have said that something being of excellent build quality and offering excellent, top of the line experience is neither sufficient nor necessary for being a luxury good.
It is true though that luxury goods are, often, top of the line as well. Cars and watches are often examples of this. Clothes are a much more mixed bag, with some luxury brands using excellent materials and craftsmanship, while others use flashy design and branding with mediocre materials and craftsmanship.
Exactly where Apple sits is very debatable in my experience. I would personally say that many of their products are far too affordable and simple to be considered luxury products - the iPhone in particular. The laptops I'm less sure about.