Don't be judgemental? Jesus Christ, man; you don't know what my needs are, or what other people's abilities are, but you're assuming to know both, and assuming that anything outside the bare minimum for people "hundreds of years ago" is luxury. Society and civilization is NOT what it was "hundreds of years ago". Neither they, nor you, are a default model by which all current people are measured.
I have neurological disabilities that makes it extremely difficult for me to deal with maps (and other things) that a Palm Pilot, and then an iPhone, resolved for me, enabling me able to function like any other adult. But I guess I should have been dumped in a pit somewhere for inferior genetics. Are glasses also a luxury, or do you grant that people need corrected vision?
These things are literally an assistive technology device for me, and for many other people. They're literally defined as such in various disability assistance programs. Yet, you're telling me about justifying luxury purchases? You're criticizing a person you know nothing about for the "luxury" of having *A* phone to make his life livable, so you could insert yourself into a situation to defend someone else's wasteful buying of a new phone every year *because it's fun*.
Step back a bit and make a critical examination of what you're doing here.
And no, "broadly speaking, don’t take it personal" doesn't get you off the hook for your presumptions. You don't know what everyone else *needs*.