Sure, it's their money, but a person whom purchases a smartphone that either...

a) doesn't have a removable battery,

*Your device is destined to become a pseudo-brick within two to three years. That's the average lifespan of your standard lithium-ion battery. 

b) doesn't have a slot for an SD card,

*Enjoy your measly fixed amount of memory. You're missing out on truly savage monsters [url=https://www.amazon.com/PNY-Elite-Performance-512GB-P-SDX512U3H-GE/dp/B00XJRX01M/ref=sr_1_1/183-4634910-2450867?ie=UTF8&qid=1467246041&sr=8-1&keywords=512gb+sd+card]like this bit of technological brilliance[/url] if you run with a scam smartphone. 

c) doesn't have physical home screen buttons,

*Any handset that comes with integrated home screen buttons is a handset that's cheating you out of about 1/4th to 1/3rd of an inch in screen size.

...should familiarize themselves with the painfully obvious role handset firms (and other corporations) play in propagating and reinforcing America's degenerative consumerist culture. A smartphone that is afflicted with the aforementioned slights is objectively garbage. No ifs, ands, or buts. 

I personally know a guy whom picked up some budget handset that was horrifically marred with all three of those cancerous transgressions: 8GB of internal memory (not including the space required for the OS and the bloatware that shipped with it) and no SD card slot, integrated home screen buttons, and an internal battery welded to the interior of the body for a nice little finish. 

Had to be the worst phone I had ever laid eyes upon.