I have WiFi only because I don't travel or have a need for it outside the home. I also have a 32GB as opposed to a 64GB as I consider for my usage the latter to be excessive. I also don't have, or need an iPhone or smartphone, I just own an old dumb-ass one, granted it does have Internet connectivity, which I never use I may add because of the costs involved as the phone is Pay As You Go.
You may need 3G and 64GB, I don't, do I need to be connected to the net 24/7? Hell no, I've better things to do with my time, in the same way I don't have to be constantly texting and emailing to feel connected to others. That's the reason why there are different models, spending extra money for bells and whistles when you don't need them is pointless.
We're not all drones, we use technology in different ways. I'm just grateful that Apple gave me the choice to save money on additions I neither need or will seldom use.