Saying 16GB storage is good enough 2016 is just, sorry to say it, stupid.
You have 11,6GB free on a fresh iphone with 16GB storage.
And you claim you have 6GB free? This means that you:
1. Either have very little text conversation och delete frequently (Message + Whatsapp is 2,8GB on mine)
2. You take very small amount of pictures or remove them often (Photo takes 3GB on mine with icloud backup and optz)
3. You dont game
4. You have no heavy apps
5. You have few apps.
Congratulation, you are not the avarage customer.
If all he/she needs is 10-20 apps and 16 GB is enough then it's what they buy. WTF is your problem.
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Yes, your wife represents a statistical sample of all iPhone users.
*changing username to no-one*
Well 16 GB is the best seller, so yes, probably she does represent.