It probably doesn't have as good a display or as good a camera
No, the display is only 720p, which is plenty on a four inch screen. 1080p on that phone would be like putting a 440 cubic inch engine in a car; the car would be capable of doing 175 mph but you can't really use that extra power. Camera is 5.5 megapixels, yours is probably 8. But someone at Felbers with an older iPhone was oohing and aahing over the pictures on mine.
I doubt it's as snappy to do things like display mail without a wireless connection.
It will not only display email (same yahoo account I've had for a decade) whether or not wifi is on, it beeps when a new email comes in.
What feature does yours have that would warrant spending the money on it?
I don't need a case for my phone, if it breaks then so what? I'd hate to break a $600 phone but I can easily replace the one I have.
Similarly, my mother-in-law has one of those $90K cars, and it's very nice. It's a noticeably more comfortable ride than my '08 Civic, which is probably more comfortable than your Chrysler.
It's not a $90k car, but my sister got a new Lexus and my brother in law gave me a ride in it, the old Concorde was a lot more comfortable than her Lexux. It was probably a $30k-40k car new, I paid $10k. They sell houses, so they have to look prosperous so the Lexux makes sense in their case.
This means that you will not understand why companies win and lose, and if you ever get into the business side it will almost certainly hinder you badly.
Business does not interest me. I retire next February, comfortably, I might add. Once you spend it it's gone. Sorry if it offends you, but wasting money is stupid unless you're Bill Gates or Larry Ellison.