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If so what are the main reasons I should upgrade?
Better cameras, better display (ProMotion and higher max brightness), better battery, faster processor, more screen real estate (smaller cutout), and MagSafe (probably stronger than the 13PM too). And hopefully other cool stuff we don’t even know about yet.
 
Depends on what you do. If you are just going to snap some photos, phone calls, text messaging, social networking etc, I found even iPhone X is sufficient. I am not planning upgrading, since I don't feel like spending this kind of money that I can't use most of power.
 
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